Use SaberMod 4.10 for ROM

For kernel toolchain, add flag in device tree to
select which toolchain to use.

Eg i9300, use Linaro 4.8

Add flag in BoardConfig.mk

ARM_EABI_TOOLCHAIN := $(ANDROID_BUILD_TOP)/prebuilts/gcc/linux-x86/arm/arm-eabi-4.8/bin

https://github.com/temasek/android_device_samsung_i9300/commit/8a03be45b058d940876f04cb37aa47f330656f7f