mach-msm: htc: Add marvel board file for gpiomux.

All gpio init will be ported into this.  The new gpiomux api will
make the use of gpio stuffs more clear.
mach-msm: htc: Switch Marvel-Rfkill to gpiomux

This is compile tested only.
mach-msm: htc: marvel gpiomux fixups

Add gpiomux to the Makefile and fix some typos to get it to build.
mach-msm: htc: Update marvel-keypad to gpiomux
mach-msm: htc: Finish marvel-keypad

This updates marvel-keypad to reflect the in-kernel API differences
mach-msm: htc: Get marvel-panel building.

Moves gpio configuration to gpiomux, and comments parts that are
not in the msm-caf kernel's drivers.  May need to be revised later
to implement those functions that are not used currently.