Rename config to gfhd254 to match spec.

Change-Id: I59ebeb40d5eef3c28e15bebac6c441a75137bab0
diff --git a/arch/arm/configs/bruno_gfhd300_defconfig b/arch/arm/configs/bruno_gfhd254_defconfig
similarity index 100%
rename from arch/arm/configs/bruno_gfhd300_defconfig
rename to arch/arm/configs/bruno_gfhd254_defconfig