Devicetree changes for omaps for v5.13

Mostly configures addtional devices for various boards, and
updates the gpio line names for beagle boards so userspace can
optionally find the right lines:

- Use unique gpio line names for am335x-pocketbeagle

- Update omap3-echo led configuration and add ath6kl node

- Fix indentation for am3 tscadc node

- Prepare motorola-cpcap-mapphone for power supply dtbs_check_parsing

- Use unique gpio line names for am335x-boneblack.dts
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