[new uImage] Define a API for image handling operations

- Add inline helper macros for basic header processing
- Move common non inline code common/image.c
- Replace direct header access with the API routines
- Rename IH_CPU_* to IH_ARCH_*

Signed-off-by: Marian Balakowicz <m8@semihalf.com>
diff --git a/common/lynxkdi.c b/common/lynxkdi.c
index 76a271b..16dc968 100644
--- a/common/lynxkdi.c
+++ b/common/lynxkdi.c
@@ -25,10 +25,10 @@
 #if defined(CONFIG_MPC8260) || defined(CONFIG_440EP) || defined(CONFIG_440GR)
 void lynxkdi_boot ( image_header_t *hdr )
 {
-	void (*lynxkdi)(void) = (void(*)(void)) ntohl(hdr->ih_ep);
+	void (*lynxkdi)(void) = (void(*)(void))image_get_ep (hdr);
 	lynxos_bootparms_t *parms = (lynxos_bootparms_t *)0x0020;
 	bd_t *kbd;
-	u32 *psz = (u32 *)(ntohl(hdr->ih_load) + 0x0204);
+	u32 *psz = (u32 *)(image_get_load (hdr) + 0x0204);
 
 	memset( parms, 0, sizeof(*parms));
 	kbd = gd->bd;
@@ -40,9 +40,9 @@
 	/* Do a simple check for Bluecat so we can pass the
 	 * kernel command line parameters.
 	 */
-	if( le32_to_cpu(*psz) == ntohl(hdr->ih_size) ){	/* FIXME: NOT SURE HERE ! */
+	if( le32_to_cpu(*psz) == image_get_data_size (hdr) ){	/* FIXME: NOT SURE HERE ! */
 	    char *args;
-	    char *cmdline = (char *)(ntohl(hdr->ih_load) + 0x020c);
+	    char *cmdline = (char *)(image_get_load (hdr) + 0x020c);
 	    int len;
 
 	    printf("Booting Bluecat KDI ...\n");