ui: Add EXYNOS4 support

exynos4: getphys implementation on buffermanager for samsung omx

Change-Id: Iee665f56aaf601479d796703db983ca5fce9c5c3

Conflicts:
	libs/ui/GraphicBufferMapper.cpp

ui: exynos4: getphys is common

Change-Id: I1dc9c2ced0700072e7c30c8435676873b10c7026

Conflicts:
	libs/ui/GraphicBufferMapper.cpp

GraphicBuffer: exynos4: set FIMC1 usage bit on samsung specific formats

Change-Id: Ia8cde7e594f8be464ef15eaae453872ee5aa2768

Conflicts:
	libs/ui/GraphicBufferAllocator.cpp

libui: exynos4: apply FIMC usage flag on format HAL_PIXEL_FORMAT_YCbCr_420_SP_TILED

Change-Id: I8a98e593cb60d0843e83a5e431142410e26d82e7

Change-Id: Ic9caf26bf2cefe71b9dc11d5a82a67ee7a94db02