Merge changes I430cf57b,I51f02f67,I464f13f3 into eclair

* changes:
  fix [2168528] enable glTexImage2D code path in SF for software-only buffers
  fix [2168531] have software-only gralloc buffer side-step the HAL
  fix [2167050] glTexImage2D code path buggy in SurfaceFlinger