Merge https://source.denx.de/u-boot/custodians/u-boot-usb

Makefile

arch/arm/Kconfig

common/spl/spl_sdp.c

common/usb_hub.c

common/usb_kbd.c

configs/corstone1000_defconfig

drivers/usb/Kconfig

drivers/usb/common/Makefile

drivers/usb/common/usb_urb.c

drivers/usb/dwc3/dwc3-generic.c

drivers/usb/host/r8a66597-hcd.c

drivers/usb/isp1760/Kconfig

drivers/usb/isp1760/Makefile

drivers/usb/isp1760/isp1760-core.c

drivers/usb/isp1760/isp1760-core.h

drivers/usb/isp1760/isp1760-hcd.c

drivers/usb/isp1760/isp1760-hcd.h

drivers/usb/isp1760/isp1760-if.c

drivers/usb/isp1760/isp1760-regs.h

drivers/usb/isp1760/isp1760-uboot.c