av: Use QCOM_BSP_LEGACY ifdefs for interlace handling

 * This demolished video playback on 8974.

Change-Id: Ifca5319669c463993fca05218c06ccf49cbe6c06
Clean some intermediates for BSP update

* Clean libstagefright, libmedia and libmediaplayerservice.

Change-Id: I3a8b35828c64f1e6452a29461809b1663987b61e