gfrg200: change UBI aging threshold.

The description for this option says the default is fine for SLC NAND, but
they recommend much smaller numbers for MLC NAND (which wear out much
faster), and that's what gfrg200 devices use.

Change-Id: Id97a04d253aabed9646ec0597a3adf9e711678db
diff --git a/arch/arm/configs/gfrg200_defconfig b/arch/arm/configs/gfrg200_defconfig
index 32b8e80..6242ab7 100644
--- a/arch/arm/configs/gfrg200_defconfig
+++ b/arch/arm/configs/gfrg200_defconfig
@@ -201,6 +201,7 @@
 CONFIG_MTD_NAND_ECC_BCH=y
 CONFIG_MTD_NAND_COMCERTO=y
 CONFIG_MTD_UBI=y
+CONFIG_MTD_UBI_WL_THRESHOLD=128
 CONFIG_MTD_UBI_BEB_RESERVE=25
 CONFIG_MTD_UBI_GLUEBI=y
 CONFIG_MISC_DEVICES=y