Reset controller updates for v5.20

Allow reset-simple to be selected under EXPERT and reset-a10sr to be
built under COMPILE_TEST. Add Renesas RZ/G2UL USBPHY binding and a new
driver for the TI TPS380x line of voltage supervisor ICs with manual
reset control.

A patch to make reset-microchip-sparx5 buildable as a module had to be
reverted as that turned out to break MDIO on kswitch-d10.
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