video: msm: wfd: Add turbo mode support

Add support for userspace to push the video core clock to maximum
supported by hardware.

Change-Id: I47295d0fc67d32302312600a90359be23e3fc2c2
CRs-Fixed: 361108
Signed-off-by: Srinu Gorle <sgorle@codeaurora.org>

Conflicts:
	arch/arm/mach-msm/include/mach/board.h
	include/linux/videodev2.h