display5: config: Add GPT verification and restoration code on SWUpdate entry

If GPT gets broken, then after N boot attempts we will run the SWUpdate
restoration image.
On its enter we will check GPT and restore it if needed.

To test it:
display5 > mmc write 0x12000000 4 8

It will overwrite the primary GPT table.

Signed-off-by: Lukasz Majewski <lukma@denx.de>

include/configs/display5.h

@@ -144,6 +144,16 @@
 	"echo '#######################';" \
 	"echo '# RECOVERY SWUupdate  #';" \
 	"echo '#######################';" \
+	"echo '#######################';" \
+	"echo '# GPT verify          #';" \
+	"if gpt verify mmc ${mmcdev} ${partitions}; then " \
+		"echo '# OK !                #';" \
+	"else " \
+		"echo '# FAILED !            #';" \
+		"echo '# GPT RESTORATION     #';" \
+		"gpt write mmc ${mmcdev} ${partitions};" \
+	"fi;" \
+	"echo '#######################';" \
 	"setenv loadaddr_swu_initramfs 0x14000000;" \
 	"setenv bootargs console=${console} " \
 		"ip=${ipaddr}:${serverip}:${gatewayip}:${netmask}" \