msm: mdp: Adjust bandwidth parameters

720p video on 1080p panel have upscaling, mdp clk should not be
increased for this case. Also slightly increase mdp ib to make
sure there is no bw access bottleneck.

Change-Id: I2fa4cf87742d02fbf1b7ada7fee652a0ca2d6b13
Signed-off-by: Huaibin Yang <huaibiny@codeaurora.org>
Signed-off-by: naseer <naseer@codeaurora.org>