usb: Move 'bmRequestType' USB device request macros from EHCI header

usb: Move 'bmRequestType' USB device request macros from EHCI header

Macros defining bmRequestType field of USB device request,
given in table 9.2 USB 2.0 spec, are rather generic macros
which can be further used by other Host controller stacks.
So moving them to usb_defs header.

Signed-off-by: Vivek Gautam <[email protected]>
Cc: Julius Werner <[email protected]>
Cc: Simon Glass <[email protected]>
Cc: Minkyu Kang <[email protected]>
Cc: Dan Murphy <[email protected]>
Cc: Marek Vasut <[email protected]>