[RFC] ARM: sun6i: dt: Add USB EHCI bindings for Mele M9

ref from arokux 8317d4d5
NOT COMPILE
[RFC] ARM: sun6i: dt: change ehci interrupt

change interrupt accordign to downstream code:
http://git.hands.com/linux.git
arch/arm/mach-sun6i/include/mach/irqs-sun6i.h
Merge branch 'sun6i_usb' of github.com:bjzhang/linux-allwinner into sun6i_usb