mdss: provide "early suspend" support for X governors

now that they've deprecated real early suspend, use mdss panel driver
to determine whether screen is on or off

Conflicts:
	drivers/video/msm/mdss/mdss_samsung_dsi_panel.c
mdss: reduce screen corruption during suspend/resume

adapted from codeaurora's f0a2dd2
cpufreq: interactiveX V4: limit max freq when screen off

screen_off_max configurable via sysfs - default 1267200

Conflicts:
	drivers/cpufreq/cpufreq_interactive.c
cpufreq: ondemandX - screen_off_maxfreq support
cpufreq: ondemand: set screen off max freq to 2.2ghz