Omap device tree fixes for issue discovered during the merge window:

- Fix triggering for GPIO interrupts that's needed for 4430sdp
  Ethernet. Otherwise booting with nfsroot won't work.

- Fix CPU operating point values

- Fix wrong assumption that twl PMIC is always connected to omap3

- Add gpmc for am33xx so beaglebone users can use the bus

- Cosmetic fix for mcspi pin muxing to avoid confusion
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