Enable Loopback device support in the kernel.

Change-Id: Ia984aa2f5d3c20ae784b2d1b478828d144d6d0b7
diff --git a/arch/arm/configs/gfrg200_defconfig b/arch/arm/configs/gfrg200_defconfig
index ede2aef..b100a6f 100644
--- a/arch/arm/configs/gfrg200_defconfig
+++ b/arch/arm/configs/gfrg200_defconfig
@@ -173,6 +173,7 @@
 CONFIG_MTD_UBI_WL_THRESHOLD=128
 CONFIG_MTD_UBI_BEB_RESERVE=25
 CONFIG_MTD_UBI_GLUEBI=y
+CONFIG_BLK_DEV_LOOP=y
 CONFIG_MISC_DEVICES=y
 CONFIG_EEPROM_AT24=y
 CONFIG_SCSI_MULTI_LUN=y