mm-video-v4l2: Deprecate Hybrid HP api

Client cannot set Hybrid HP api directly via extension.
Client needs to rely on standard encoding extension to enable
layer encoding. OMX component internally decides to enable
Hybrid HP layer encoding based on VBR_CFR RC mode.

CRs-Fixed: 2261962
Change-Id: Ia981bf44209cb25f48a16aa80f476c5d94bb7720

• mm-core/inc/OMX_QCOMExtns.h[diff]
• mm-video-v4l2/vidc/venc/inc/video_encoder_device_v4l2.h[diff]
• mm-video-v4l2/vidc/venc/src/omx_video_encoder.cpp[diff]
• mm-video-v4l2/vidc/venc/src/video_encoder_device_v4l2.cpp[diff]