Devicetree changes for omaps for v5.16

These changes configure devices for am335x and dra7, and fixes
various devicetree check warnings for gta04:

- Update am335x-pocketbeagle to use pinconf-single

- A series of devicetree warning fixes for omap3 and gta04

- Configure bb2d Vivante GC 2D Accelerator for dra7
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