msm: vidc: fix video encoder bw calculation issues

- fix overflow issue when calculating y_bw_no_ubwc_xbpp
- use FP divide to calculate collocated bw
- use actual bitrate instead of pre-defined value
- use correct value for tnbr_per_lcu
- mese_read multiply with 1.37 factor, not divide
- refine compression factors for input yuv
- use the total bw for DDR+LLC for LLCC ab

Change-Id: I8056c329c267b63609ea9a1e3c596d9b2cb508f0
Signed-off-by: Qiwei Liu <qiweil@codeaurora.org>