More devicetree changes for omaps

Devicetree updates for few boards and more clean-up for make dtbs warnings:

- Updates for am335x-myirtech oscillator and mtd

- Firmware configuration for i2c voltage scaling and IO isolation for am3/4
  that are wired for these features

- A series of omap3 clock node clean-up for make dtbs warnings for
  unique_unit_address and node_name_chars_strict

- Updates for dma-channel usage to add the generic dma-common properties
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