Fixes for omaps against v4.6-rc2, mostly to fix suspend for beagle-x15

that broke when we added runtime based SoC revision detection earlier.

It seems suspend worked earlier as things were only partially initialized,
while now we initialize things properly for dra7. Let's also add a warning
if SoC is not properly detected to prevent similar issues later on.

Also included is a fix for dra7 sys_32k_ck clock source that is not
enabled on boot making system fall back to using emulated clock.
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