msm: mdss: enable clamp control configuration during clock on/off

Enable MMSS clamp control configuration during clock on and off cases
on DSI v1.04. This clamp configuration helps in retaining PHY register
configuration when the MDSS gdsc is toggled.

Change-Id: I403417442aedd394d4e8d7c4d20c361c2130dbb1
Signed-off-by: Jeevan Shriram <jshriram@codeaurora.org>