libstagefright: Enable meta mode for 7x27a video encoder

msm7627a family of chipsets supports only one input frame at
one time. camera expects the input frame to be released before
sending another frame. so send one input buffer and available
output bufefrs to video encoder component. Release the input
buffer to camera (to get another frame) after receiving input
frame done callback from video encoder component.

Change-Id: I8fbc911f046ff7e2a3047dd65d8c09ac2d8608e2

Conflicts:
	media/libmediaplayerservice/Android.mk
Frameworks/Av: Add SP_ADRENO support for encoder

SP_ADRENO color format support is added for
SW encoder. This format is supported by GPU
natively. Using SP_ADRENO avoids memcpy and
color conversion operations currently performed
in GPU for normal semi planar format and improves
SW encoder performance.

Change-Id: I14a802e1ccf743063f8d2fdcf163e576eac36c29

Conflicts:
	media/libstagefright/CameraSource.cpp
	media/libstagefright/OMXCodec.cpp