ti_armv7_common: env: Fix hard coded mmc device for uuid

Avoid use of hard coded mmcdev value, use bootpart
instead, so finduuid works based on bootpart set
for a specific platform.

Signed-off-by: Ravi Babu <ravibabu@ti.com>
Reviewed-by: Tom Rini <trini@konsulko.com>

include/configs/ti_armv7_common.h

@@ -59,7 +59,7 @@
 #define DEFAULT_MMC_TI_ARGS \
 	"mmcdev=0\0" \
 	"mmcrootfstype=ext4 rootwait\0" \
-	"finduuid=part uuid mmc 0:2 uuid\0" \
+	"finduuid=part uuid mmc ${bootpart} uuid\0" \
 	"args_mmc=run finduuid;setenv bootargs console=${console} " \
 		"${optargs} " \
 		"root=PARTUUID=${uuid} rw " \