mm-core: Add mpeg2 secure component role in 8916 registry table

During mpeg2 secure playback, the client calls the OMX_GetHandle
method which locates the component specified by the component name,
OMX.qcom.video.decoder.mpeg2.secure,and loads that component
into the memory.

This change adds mpeg2 secure component role in 8916 registry table.

Change-Id: Ie617a464ea866b11147c6d3b0d9d91637fad1341