Thermal Governor: Added duty cycle governor

Add the OMAP duty cycle governor to the thermal framework.
This component will impose the policy for the PCB temp
sensor in case ondie sensor is absent.

Change-Id: I05f7272445567cf74be6f0932d7024f0d9d34dee
Signed-off-by: Eugen Mandrenko <ievgen.mandrenko@ti.com>
modified for TUNA board by faux123
board/omap2plus: add missing thermal framework code from OMAPZOOM.org baseline

Signed-off-by: Willi Ye <williye97@gmail.com>

Conflicts:
	arch/arm/mach-omap2/omap2plus-cpufreq.c

Conflicts:
	arch/arm/mach-omap2/omap2plus-cpufreq.c

Conflicts:
	arch/arm/mach-omap2/omap2plus-cpufreq.c