msm: vidc: Populate slice size capabilities

Read slice size capabilities for MB and BYTE mode.
Pass those to HAL when requested.

CRs-Fixed: 2052531
Change-Id: Ibf11c7c5999064a8ad31f253b3ebcbcd743e1683
Signed-off-by: Saurabh Kothawade <skothawa@codeaurora.org>