keystone2: env: Set mmc as default boot for k2g-evm

For k2l, k2e and k2hk, ubi is set to default boot in uboot
environment settings; while for k2g, mmc should be the
default boot. This patch is to set mmc as default for k2g-evm

Signed-off-by: Yan Liu <yan-liu@ti.com>
Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
diff --git a/include/configs/k2l_evm.h b/include/configs/k2l_evm.h
index 829daa2..f366e67 100644
--- a/include/configs/k2l_evm.h
+++ b/include/configs/k2l_evm.h
@@ -17,6 +17,7 @@
 /* U-Boot general configuration */
 #define CONFIG_EXTRA_ENV_KS2_BOARD_SETTINGS				\
 	DEFAULT_FW_INITRAMFS_BOOT_ENV					\
+	"boot=ubi\0"							\
 	"addr_mon=0x0c140000\0"						\
 	"args_ubi=setenv bootargs ${bootargs} rootfstype=ubifs "	\
 	"root=ubi0:rootfs rootflags=sync rw ubi.mtd=ubifs,4096\0"	\