Splitting hardware/qcom/display chip specific.

Moved msm8960 specific code in msm8960/ directory.
Moved msm8974 specific code in msm8974/ directory.
Updated Makefiles to point to correct header files.

Change-Id: I0623022f324be0ae42571660074f16afa1f71df5

Conflicts:
	Android.mk
	msm8960/liboverlay/overlayCtrl.cpp
	msm8974/common.mk