mtd: detect image format when writing

Recently TRX checking code was changed to detect Seama format and don't
abort whole writing operation because of it. This isn't a good long-term
solution. It's a poor idea to teach every format handler recognizing all
possible formats. Instead it should be handled in a generic code which
should run check depending on the detected format.

This will also allow further improvements like fixing formats other than
TRX after replacing JFFS2.

Signed-off-by: Rafał Miłecki <zajec5@gmail.com>

SVN-Revision: 48639

package/system/mtd/src/mtd.h

@@ -3,7 +3,7 @@
 
 #include <stdbool.h>
 
-#ifdef target_brcm47xx
+#if defined(target_brcm47xx) || defined(target_bcm53xx)
 #define target_brcm 1
 #endif