risc-v: split the jh7100 clock controller driver

In preparation for the JH7110 clock driver split the clock definition
and attachment code from the clock handling macros / methods.

risc-v: add a driver the JH7100 pin controller

risc-v: attach the Cadence XHCI usb controller on the JH7100 SoC

risc-v: add a StarTech JH7100 SoC clock driver

The JH7100 is seen in the Beagle-V board.

risc-v: add a driver the JH7100 pin controller

risc-v: attach the Cadence XHCI usb controller on the JH7100 SoC

risc-v: add a StarTech JH7100 SoC clock driver

The JH7100 is seen in the Beagle-V board.

risc-v: attach the Cadence XHCI usb controller on the JH7100 SoC

risc-v: add a StarTech JH7100 SoC clock driver

The JH7100 is seen in the Beagle-V board.