set target_cpu_variant

sir arco, I'm not sure if this change is good. But I always get a failure by building latest cwm touch with jenkins.

"bionic/libc/Android.mk:429: TARGET_CPU_VARIANT is not defined
bionic/libc/arch-arm/arm.mk:30: *** "TARGET_CPU_VARIANT not set or set to an unknown value. Possible values are cortex-a5, cortex-a7, cortex-a8, cortex-a9, cortex-a15, krait, scorpion. Use generic for devices that do not have a CPU similar to any of the supported cpu variants.".  Stop.
build error!
Build failed."

But this change doesn't help. Do you know how to set it correctly? Am I in the right file?

Sorry for the attached graphics.c, ignor it. I have to learn github :D