video: msm: Fix initial state of LCD backlight

 * For devices which use the LCD backlight (such as D2), we need
   to actually call the function which sets the brightness after
   initializing it in the probe.

Change-Id: Id6b7c0de3cd31181394c56c7f6061bca9defd861
msm: Raise MDP bandwidth factor for Samsung HD panel

 * We're seeing underruns in certain applications such as Swype and
   Thumb Keyboard. Raise the bandwidth factors to fix this.

Change-Id: Icddd1d2034b0699ed2505c4adafbd14ddc20e942