msm: mdss: update value of tclk pre and post for dynamic resolution switch

Currently in case of dynamic resolution switch for HDMI TVs connected
through DSI to HDMI bridge chip, the DSI PHY parameters tclk pre and
tclk post are not getting updated based on new resolution for platforms
where DSI PHY revision 2 is used.
This change updates the required values during resolution switch case.

Change-Id: I7fb814d0327b3b39e648e19b9cb1ae6339475407
Signed-off-by: Sandeep Panda <spanda@codeaurora.org>