msm: vidc: align same default frame rate between video driver and firmware

Video driver is ignoring client frame rate setting, if existing frame rate
and client setting are same. Due to this venus firmware is encoding with
default frame rate 15,  which is causing output bit rate deviation.

This change make sure, default frame rates in video driver and
venus firmware are same.

Change-Id: I506799bca077b644e65cca1bb1cd8e9414400424
Signed-off-by: Srinu Gorle <sgorle@codeaurora.org>