mm-video: Allow devices to override QComOMXMetadata header

* Certain manufacturers add extra fields to the
  encoder_media_buffer_type struct.

Change-Id: I2485196c2ab5d798a1dcd2353c9f8cc5114987f8
Use NO_IOMMU for msm7x30 too

Change-Id: I048747b1744cb7341466a45e03c93c5415b4b34c
mm-core: Enable HW mp3 decoder for msm7x30

* Enable hardware mp3 decoder
* Cleanup the code style
* Update copyrights

Change-Id: I1ea17ad91315d2a3ad86d17874b3cbbe22f85f01