vidc: venc: Add support for AVCProfileConstrainedBaseline

This change adds AVCProfileConstrainedBaseline profile
support for H264 encoder. OMX Client can now set this
profile to get required profile settings in SPS NAL unit
from video component.

CRs-Fixed:525412

Change-Id: Id15f620cd3a39b199b2750db92ac1c23bc083c88