build omxcore for msm7x27

I'm being lazy, just use msm7x27a stuff here :P

Change-Id: Ide2497abff8c888c53763f3ca74a732c5bbdd778
modify makefiles for qcom legacy
mm-core: Add QC specific MetaData and MediaDefs

- to integrate extened extractor with existing framework
  new QC specific MetaData and MediaDefs are required.
- create new files to avoid changing stock MetaData and
  MediaDefs file

Change-Id: If32e182337fa4be8b039367729ffa6cecefd8115
mm-core: Add kKeySmoothStreaming

Change-Id: I93036781cab1d81d8e22a626d61348b71203380b
mm-core: Add key for HFR encoding

Change-Id: I0aa6978eaad25418260114fdad94d3294a0205c7
separate media variant from display variant