pmem/vidc: Workaround for Xperia 2011 camera framerate

Make video encoding less cpu intensive by using the camera recording
buffer as input for the encoder, no more copying to temporary adsp buffer.

Now getting 28 fps with stabiliztation on, and 29.5 fps with stabilization off.

Credits: miniuser123@xda

Change-Id: I030425286bf77700adb550a065a4044a251687f0