omap-for-v4.3/fixes-merge-window

Few omap bug fixes that have come up recently:

- Fix deferred probe with omap_device idling unused devices

- Fix booting if no timer parent can be set

- Fix always true warning for vc register check

And also two minor changes not strictly fixes:

- Add SoC detection for dra752

- Enable omap related MUSB DMA engines as we can now
  build them all in finally
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