media-caf: update includes to point to correct location
media-caf: Add TARGET_QCOM_MEDIA_VARIANT filtering

Only build if it's set to caf

Change-Id: Ia4fa6130bcb0653a88584b9dff7aef33716a01e0
Fix handling of display vs. display-caf

Originally written by Steve Kondik at
https://github.com/CyanogenMod/android_hardware_qcom_media-caf/commit/5234181ec526471bdacadd876cc202b65c53035b

Reworked to only handle deltas between display and display-caf

Change-Id: Ia47e55f46e07266d18854f29bae7aec4903288d6
media-caf: fix 7x27a support

Conflicts:

	Android.mk

Change-Id: I4c09352698ca432ed69832f3932552f48ef1616a
Merge remote-tracking branch 'omni/qcom-4.4_2.7' into kk4.4

Conflicts:
	Android.mk
	libc2dcolorconvert/Android.mk
	mm-video/vidc/vdec/Android.mk
	mm-video/vidc/venc/Android.mk