Revert "Makefile: Compile with SaberMod GCC 4.9 toolchain"

* It seems like the Cortex-A15 optimized Linaro toolchain supports graphite.
* The Linaro toolchain should be better optimized over the generic SaberMod toolchain.

This reverts commit e73b4f0240a41061b97db788aad162e4abbffcaf.

Signed-off-by: Zhao Wei Liew <zhaoweiliew@gmail.com>