msm_fb : display : Change fps level dynamically.

This change lets the user modify the fps level dynamically using
sysfs interface.

Change-Id: Ie99bbca5ec1a0b5ff5fa3570874b254e3fb7235c
Signed-off-by: Vishnuvardhan Prodduturi <vproddut@codeaurora.org>

Conflicts:
	drivers/video/msm/mipi_dsi.c
	drivers/video/msm/mipi_dsi.h
	drivers/video/msm/mipi_dsi_host.c
	drivers/video/msm/msm_dss_io_8960.c
	drivers/video/msm/msm_fb_panel.c
	drivers/video/msm/msm_fb_panel.h