android: use common DRM driver detection code.

android: use common DRM driver detection code.

Change the driver used for android. Libva has to load the correct
driver and retain the vendor and device id's.

This change is to re-use common drm utils code for driver name
detection. Also removed non-android code in android specific files
and unneeded files in android directory.

Change-Id: I2893d8fcadfbf911e7c0b421a4e90d5aeb0d619e
Signed-off-by: Daniel Charles <daniel.charles@intel.com> (change driver)
Signed-off-by: Haitao Huang <haitao.huang@intel.com> (update using drm util)
Signed-off-by: Gwenole Beauchesne <gwenole.beauchesne@intel.com> (add missing headers)