[new uImage] Add dual format uImage support framework

This patch adds framework for dual format images. Format detection is added
and the bootm controll flow is updated to include cases for new FIT format
uImages.

When the legacy (image_header based) format is detected appropriate
legacy specific handling is invoked. For the new (FIT based) format uImages
dual boot framework has a minial support, that will only print out a
corresponding debug messages. Implementation of the FIT specific handling will
be added in following patches.

Signed-off-by: Marian Balakowicz <m8@semihalf.com>
diff --git a/board/trab/auto_update.c b/board/trab/auto_update.c
index bd9ee0c..8f67535 100644
--- a/board/trab/auto_update.c
+++ b/board/trab/auto_update.c
@@ -211,6 +211,12 @@
 	image_header_t *hdr;
 
 	hdr = (image_header_t *)LOAD_ADDR;
+#if defined(CONFIG_FIT)
+	if (gen_image_get_format ((void *)hdr) != IMAGE_FORMAT_LEGACY) {
+		puts ("Non legacy image format not supported\n");
+		return -1;
+	}
+#endif
 
 	if (nbytes != image_get_image_size (hdr))
 	{
@@ -234,6 +240,13 @@
 	unsigned char buf[4];
 
 	hdr = (image_header_t *)LOAD_ADDR;
+#if defined(CONFIG_FIT)
+	if (gen_image_get_format ((void *)hdr) != IMAGE_FORMAT_LEGACY) {
+		puts ("Non legacy image format not supported\n");
+		return -1;
+	}
+#endif
+
 	/* check the easy ones first */
 #undef CHECK_VALID_DEBUG
 #ifdef CHECK_VALID_DEBUG
@@ -327,6 +340,12 @@
 	uint nbytes;
 
 	hdr = (image_header_t *)LOAD_ADDR;
+#if defined(CONFIG_FIT)
+	if (gen_image_get_format ((void *)hdr) != IMAGE_FORMAT_LEGACY) {
+		puts ("Non legacy image format not supported\n");
+		return -1;
+	}
+#endif
 
 	/* disable the power switch */
 	*CPLD_VFD_BK |= POWER_OFF;
@@ -417,6 +436,13 @@
 	}
 
 	hdr = (image_header_t *)LOAD_ADDR;
+#if defined(CONFIG_FIT)
+	if (gen_image_get_format ((void *)hdr) != IMAGE_FORMAT_LEGACY) {
+		puts ("Non legacy image format not supported\n");
+		return -1;
+	}
+#endif
+
 	/* write the time field into EEPROM */
 	off = auee_off[idx].time;
 	val = image_get_time (hdr);