msm: kgsl: Port kk-2.7  KGSL

Change-Id: I0dc738394994a03dac871710a4569b3f91629a97
kgsl: fix genalloc BUG when detroying pagetable.

kgsl allocs some memory (in map_global), but never free it.
Fixes that.
Only happens when on GPUMMU ..