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
Add libdashplayer and QCMediaPlayer kk_2.7_rb1.9

Condistionally revert "Dashplayer: enable adaptive
playback based on codec format key"
Change-Id: I0130d4e6647e524ea1f613d22d9e7dccf3600bec
Use actual kernel headers and display-caf paths if defined

Change-Id: I7338867f6eb4d88b33b610a2b2f93280ed6e71bc