mm-video: vidc: Missing release of meta buffer at encoder omx component

For 601-709 color conversion, Camera HAL extends one more entry
in native handle to put a flag and sends only when recording starts.
Because of this release of meta buffer fails in OMX video component
causing memory leak. This changes ensures release code for meta buffers.

CRs-Fixed: 627255
Change-Id: If45b2cb7bbfebc8cf791b28eb06c01e64b4991e6
1 file changed