msm: vidc: fix some issues in video bw calculation

- don't check zero value entries for CR/CF
- initialize dpb_compression_enabled to true
- fix overflow issue when calculating y_bw_no_ubwc_xbpp
- use FP divide to calculate collocated bw
- use the same compression factor for both DPB read and write
- refine LLC DPB read bw calculation
- refine OPB BW calculation
- enable LLC top line buffer for H264/VP8/MPEG2
- set correct lcu_size 32 for VP9

Change-Id: Ie0e5b64caa64d7c9833b8685eb013596d715f0d7
Signed-off-by: Qiwei Liu <qiweil@codeaurora.org>