Second set of dts changes for omap variants for v4.17

This series of patches configures few new drivers and adds
omap5 specific nodes:

- Enable USB OTG mode for xhci on am437x

- A series of changes to configure aux control module instance
  on omap5 mostly to get the audio clocks configured

- A series of changes to update droid4 for MDM6600 modem USB PHY
  and UART1 pinctrl
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