gralloc: added exynos4 specific usage bits

Change-Id: Ibd06f153bdfd282993b3f633da82d9a7017aad61
exynos4: gralloc: add camera and nonecache usage

Change-Id: I53a7dfc8355a05aeae007e7d61c4d95cce125bfd
Revert "Remove remnants of HWC 0.x"

This reverts commit 71b9c1fab92727b1463226681d7bd61aac85291b.

Change-Id: Id9c4e438d34bd421c44ce9aa8ff6c908a2331f61