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
Merge "QCMetaData: Add key for interlace" into android-4.4
Merge branch 'android-4.4' of git://github.com/omnirom/android_hardware_qcom_media.git into omni-44