Encoding: ROI support for CQP/CBR on Haswell/Ivy

Encoding: ROI support for CQP/CBR on Haswell/Ivy

v2:
remove unused variable
set max ROI number to 3 according low power mode or 8

v1:
merge 3 ROI patches together
Encoding: Add the support of ROI under CQP on Haswell/Ivybridge
Encoding: Add the support of ROI for CBR
          Currently it will allocate the different qp for the ROI and non_ROI region
          based on the ROI ratio. The qp delta is related with the ratio of ROI region.
Encoding: Expand to support multiple ROI regions.
Encoding: bits.roi_rc_qp_delat_support

user guide:
The first is that the driver should expose the feature of qp_delta in
VAConfigAttribValEncROI.

The second is that the user-app can pass the qp_delta flag in
VAEncMiscParameterBufferROI and then the driver will use the qp_delta to
calculate the corresponding qp for ROI region. For the non-ROI region: I
think that currently we can use the following model to predicate the qp.
	(qp_value = intel_qpvalue_from_qp(qp))
	 Qp_value_roi * ROI_area + qp_value_nonroi * area_nonroi = base_qp *
total_area.

Signed-off-by: ceciliapeng <cecilia.peng@intel.com>
Signed-off-by: Pengfei Qu <Pengfei.Qu@intel.com>