sf: Make sure HWC_BLENDING_NONE is set for opaque layer

Before configuring the layers to HWC, make sure
HWC_BLENDING_NONE is set if the layer is opaque.

Change-Id: Ie84aa9d93e98a244692a0cffc2de653a9079f8b4
exynos4: getphys implementation on buffermanager for samsung omx

Change-Id: Iee665f56aaf601479d796703db983ca5fce9c5c3
ui: exynos4: getphys is common

Change-Id: I1dc9c2ced0700072e7c30c8435676873b10c7026