Texas Instruments K3 SoC family changes for v5.7

- Add missing clocks to dwc3 nodes on am65x (fixes USB)
- Add DMA entries for main_spi0 on am65x
- Add phy-gmii-sel nodes for both am65x and j721e (towards ethernet
  support)
- Add DMA entries for ADC for both am65x and j721e
- Add MCU system control module on j721e (needed by phy-gmii-sel)
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