ARM: tegra: grouper: change NCT72 conversion rate
Bug 961829

NCT72 thermal sensor consumes ~3mW at 16Hz conversion rate.
At 32Hz, the power consumption ~1.5mW.
Change conversion rate to 32Hz to reduce power consumption.
LP0 power consumption will not reduce, because the sensor will
enter standby mode.
Merge branch 'nv-3.1-grouper-test' of https://github.com/enssorcel/nv-3.1-grouper into nv-3.1-grouper-test