configs: Rename CONFIG_IMAGE_FORMAT_LEGACY to CONFIG_LEGACY_IMAGE_FORMAT

The name CONFIG_LEGACY_IMAGE_FORMAT reads slightly better along with
allowing us to avoid a rather nasty Kbuild/Kconfig issue down the line
with CONFIG_IS_ENABLED(IMAGE_FORMAT_LEGACY).  In a few places outside of
cmd/ switch to using CONFIG_IS_ENABLED() to test what is set.

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/common/bootm.c b/common/bootm.c
index d193751..bea5160 100644
--- a/common/bootm.c
+++ b/common/bootm.c
@@ -98,7 +98,7 @@
 
 	/* get image parameters */
 	switch (genimg_get_format(os_hdr)) {
-#if defined(CONFIG_IMAGE_FORMAT_LEGACY)
+#if CONFIG_IS_ENABLED(LEGACY_IMAGE_FORMAT)
 	case IMAGE_FORMAT_LEGACY:
 		images.os.type = image_get_type(os_hdr);
 		images.os.comp = image_get_comp(os_hdr);
@@ -738,7 +738,7 @@
 	return ret;
 }
 
-#if defined(CONFIG_IMAGE_FORMAT_LEGACY)
+#if CONFIG_IS_ENABLED(LEGACY_IMAGE_FORMAT)
 /**
  * image_get_kernel - verify legacy format kernel image
  * @img_addr: in RAM address of the legacy format image to be verified
@@ -807,7 +807,7 @@
 				   char * const argv[], bootm_headers_t *images,
 				   ulong *os_data, ulong *os_len)
 {
-#if defined(CONFIG_IMAGE_FORMAT_LEGACY)
+#if CONFIG_IS_ENABLED(LEGACY_IMAGE_FORMAT)
 	image_header_t	*hdr;
 #endif
 	ulong		img_addr;
@@ -828,7 +828,7 @@
 	*os_data = *os_len = 0;
 	buf = map_sysmem(img_addr, 0);
 	switch (genimg_get_format(buf)) {
-#if defined(CONFIG_IMAGE_FORMAT_LEGACY)
+#if CONFIG_IS_ENABLED(LEGACY_IMAGE_FORMAT)
 	case IMAGE_FORMAT_LEGACY:
 		printf("## Booting kernel from Legacy Image at %08lx ...\n",
 		       img_addr);
diff --git a/common/image-fdt.c b/common/image-fdt.c
index eb552ca..e70da3d 100644
--- a/common/image-fdt.c
+++ b/common/image-fdt.c
@@ -33,7 +33,7 @@
 	puts(" - must RESET the board to recover.\n");
 }
 
-#if defined(CONFIG_IMAGE_FORMAT_LEGACY)
+#if CONFIG_IS_ENABLED(LEGACY_IMAGE_FORMAT)
 static const image_header_t *image_get_fdt(ulong fdt_addr)
 {
 	const image_header_t *fdt_hdr = map_sysmem(fdt_addr, 0);
@@ -263,7 +263,7 @@
 int boot_get_fdt(int flag, int argc, char * const argv[], uint8_t arch,
 		bootm_headers_t *images, char **of_flat_tree, ulong *of_size)
 {
-#if defined(CONFIG_IMAGE_FORMAT_LEGACY)
+#if CONFIG_IS_ENABLED(LEGACY_IMAGE_FORMAT)
 	const image_header_t *fdt_hdr;
 	ulong		load, load_end;
 	ulong		image_start, image_data, image_end;
@@ -344,7 +344,7 @@
 		 */
 		buf = map_sysmem(fdt_addr, 0);
 		switch (genimg_get_format(buf)) {
-#if defined(CONFIG_IMAGE_FORMAT_LEGACY)
+#if CONFIG_IS_ENABLED(LEGACY_IMAGE_FORMAT)
 		case IMAGE_FORMAT_LEGACY:
 			/* verify fdt_addr points to a valid image header */
 			printf("## Flattened Device Tree from Legacy Image at %08lx\n",
diff --git a/common/image.c b/common/image.c
index 75b84d5..9f9538f 100644
--- a/common/image.c
+++ b/common/image.c
@@ -38,7 +38,7 @@
 
 DECLARE_GLOBAL_DATA_PTR;
 
-#if defined(CONFIG_IMAGE_FORMAT_LEGACY)
+#if CONFIG_IS_ENABLED(LEGACY_IMAGE_FORMAT)
 static const image_header_t *image_get_ramdisk(ulong rd_addr, uint8_t arch,
 						int verify);
 #endif
@@ -377,7 +377,7 @@
 
 
 #ifndef USE_HOSTCC
-#if defined(CONFIG_IMAGE_FORMAT_LEGACY)
+#if CONFIG_IS_ENABLED(LEGACY_IMAGE_FORMAT)
 /**
  * image_get_ramdisk - get and verify ramdisk image
  * @rd_addr: ramdisk image start address
@@ -867,7 +867,7 @@
  */
 int genimg_get_format(const void *img_addr)
 {
-#if defined(CONFIG_IMAGE_FORMAT_LEGACY)
+#if CONFIG_IS_ENABLED(LEGACY_IMAGE_FORMAT)
 	const image_header_t *hdr;
 
 	hdr = (const image_header_t *)img_addr;
@@ -933,7 +933,7 @@
 {
 	ulong rd_addr, rd_load;
 	ulong rd_data, rd_len;
-#if defined(CONFIG_IMAGE_FORMAT_LEGACY)
+#if CONFIG_IS_ENABLED(LEGACY_IMAGE_FORMAT)
 	const image_header_t *rd_hdr;
 #endif
 	void *buf;
@@ -1025,7 +1025,7 @@
 		 */
 		buf = map_sysmem(rd_addr, 0);
 		switch (genimg_get_format(buf)) {
-#if defined(CONFIG_IMAGE_FORMAT_LEGACY)
+#if CONFIG_IS_ENABLED(LEGACY_IMAGE_FORMAT)
 		case IMAGE_FORMAT_LEGACY:
 			printf("## Loading init Ramdisk from Legacy "
 					"Image at %08lx ...\n", rd_addr);