msm_fb: MHL: Board file changes for Integrated MHL

8x30 FLUID device has integrated solution for MHL.
Power and GPIO related changes for MHL feature
is added. This is the first solution
where 8334 chipset is integrated as the MHL tx. The power
up for rails and MUX selection is specific to 8x30, since
8960 doesn't yet have this solution. This change also
includes the change to move the power and GPIO functions
to the driver from the board file.

Change-Id: I63219fb2fabf8af611792f0a4f71699553297d84
Signed-off-by: Manoj Rao <manojraj@codeaurora.org>
Signed-off-by: Pavankumar Kondeti <pkondeti@codeaurora.org>