[RFC v5 0/2] WIP: add usb keyboard driver

[Peter Mamonov]

Changes since v4:
	- usb: ehci-hcd: detect submit_*_msg() functions re-entrance
	- common: clock: introduce non interruptible version of mdelay() function
	- usb: ehci-hcd: use mdelay_non_inerruptible to avoid re-entrance

Peter Mamonov (5):
	usb: ehci-hcd: port periodic transactions implementation
	usb: ehci-hcd: detect re-entrance
	common: clock: introduce mdelay_non_interruptible()
	usb: ehci-hcd: use mdelay_non_inerruptible()
	input: port usb keyboard driver from the u-boot