Clean-up for pinctrl-single node names for omaps for v6.5

To avoid producing lots of make dtbs checks warnings when the yaml binding
for pinctrl-single gets merged, let's fix up the pin group node names. We
want to do this rather than add non-standard node name workarounds to the
yaml binding.

Also included is a non-urgent fix to move gta04 model name out of the pinmux
node that can wait for the merge window.
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