ARM: dts: msm: update MDP Bandwidth settings for msm8937

Update the max bandwidth and per pipe bandwidth settings
in MDSS DT as per recommendation from systems team.

Change-Id: Idf820393d6fd113b69bd1d21ebaf0dcf48d9be0d
Signed-off-by: Jayant Shekhar <jshekhar@codeaurora.org>