usb: cdns3: Add support for TI's AM64 SoC

commit d46caab5f8f96bc49704fd6d681005067e2beb0a from
git://git.ti.com/ti-linux-kernel/ti-linux-kernel.git



Add support for USB controller present on the AM64x SoC.

Signed-off-by: Aswath Govindraju <a-govindraju@ti.com>
Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com>
Signed-off-by: Xulin Sun <xulin.sun@windriver.com>