Merge and modify encoding bit-rate control per temporal layer.

Merge and modify encoding bit-rate control per temporal layer.

Cherry-pick'ed from:
e6f92ae: Added geneirc support for encoding bit-rate control per temporal layer
753ec17: va.h: add data structure for the structure of temporal layer encoding

v2: Update the comment that user must send VAEncMiscParameterTemporalLayerStructure before
VAEncMiscParameterRateControl and VAEncMiscParameterFrameRate and the condition for error return

Signed-off-by: Jonathan Bian <jonathan.bian@intel.com>
Signed-off-by: Austin Yuan <shengquan.yuan@intel.com>
Signed-off-by: Zhangfei Zhang <zhangfei.zhang@intel.com>
Signed-off-by: Xiang, Haihao <haihao.xiang@intel.com>
Reviewed-by: Sean V Kelley <seanvk@posteo.de>