PM related fixes for omap3 that were discovered during omap3

conversion to device tree. This series sets up the PMIC signaling
in a way where we can test for PM regressions easily by
looking at state of the the sys_clkreq and sys_off_mode pins.

Note that this series alone does not make omap3 PM to cut
off core voltage during off-idle, changes to twl4030-power.c
configurations are still needed. Those will be posted
separately.
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