drm: msm: dsi-staging: Add support to skip phy timing update

For some panels, PHY timing parameters are not as per mipi specs.
This change adds supoort to skip phy timing update during clock
switch.

Change-Id: Ibe3d689e72dd644d5c6fd1acc8125d2a0b826bf7
Signed-off-by: Ritesh Kumar <riteshk@codeaurora.org>