riscv: dts: starfive: jh7110-common: move usb0 config to board dts

riscv: dts: starfive: jh7110-common: move usb0 config to board dts

The JH7110 USB0 can operate as a dual-role USB device.  Different
boards can have different configuration.

For all current boards this device operates in peripheral mode, but
on a new board this operates in host mode.  This property will no
longer be common, so define the "dr_mode" property in the board files
rather than in the common DTSI file.

Signed-off-by: Alex Elder <elder@riscstar.com>
Signed-off-by: Guodong Xu <guodong@riscstar.com>
Reviewed-by: Emil Renner Berthing <emil.renner.berthing@canonical.com>
Signed-off-by: Conor Dooley <conor.dooley@microchip.com>