Only build when no media variant is set, and display variant isn't legacy

Change-Id: I48e12532aa15f3233df9551a1603bcb4fd7b5ade
Use actual kernel headers and display-caf paths if defined

Change-Id: I7338867f6eb4d88b33b610a2b2f93280ed6e71bc
media: fix msm8660 omx issue

for msm8660: previous code lost libOmxVdec.so & libOmxVenc.so , now fixed it!

Change-Id: Ie6db1be912f0411bca47e9bfba9d0b7053febb18
QCMetaData: Add key for interlace

key for interlace set in metadata is being used for thumbnail mode.
If the key is set, two ETB are send to the decoder

Change-Id: I1e4e996f46f022916ab5f4f14ff2c111f04717c1