android: Allow the use of prebuilts/sdk as the SDK for compilation

* Requires one change to dx in the sdk as well:

     https://github.com/Matricom/prebuilts_sdk/commit/8a0058d4f6b9267e7a595069f7b18ea219d84f22

Signed-off-by: Brandon McAnsh <brandonm@matricom.net>
DVDCodecs: Disable amcodec

* amcodec is not compatible with dvd's at the moment

Signed-off-by: Brandon McAnsh <brandonm@matricom.net>