[RFC v3 0/2] WIP: add usb keyboard driver

[Peter Mamonov]

Changes since v2:
	ehci-hcd:
		* no need for non-interruptible mdelay()
		* use dev_dbg(), dev_err() functions for messages output
		* remove excessive checks of pointers
		* use dma_alloc_coherent for memory allocation
		* use somewhat meaningful return values instead of -1
		* remove too optimistic comments from the code
	usb_kbd:
		* allocate usb_kbd_pdata.new using dma_alloc_coherent()
		* fall back to polling via control EP if interrupt polling fails
	
Peter Mamonov (2):
	usb: ehci-hcd: port periodic transactions implementation
	input: port usb keyboard driver from the u-boot