ARM: dts: msm update MDSS BW limits for 8937

Set MDSS default BW limit to 3.1G and 1.7G when camera
is active as per QOS recommendation.

Change-Id: Ida4476e54b421868b0054b8bafcfd9952ffe7be0
Signed-off-by: Kalyan Thota <kalyant@codeaurora.org>