msm: vidc: add table governor to select bus bandwidth

Add table governor which reads the bus table from dtsi
and selects the appropriate bus frequency for a given
load (MBs/second) on video hardware.

Change-Id: Iad70fcde8db2adb1fe2814816612d7bc365ecd36
Signed-off-by: Maheshwar Ajja <majja@codeaurora.org>