usb: musb: Add support for PolarFire SoC's musb controller

Add support for Microchips's PolarFire SoC's musb controller in host,
peripheral and otg mode.

Tested-by: Valentina Fernandez <valentina.fernandezalanis@microchip.com>
Signed-off-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20220613114642.1615292-2-conor.dooley@microchip.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>