sunxi-usb: workaround crashes with unaligned transfer buffers

Reuse workaround from terga EHCI driver to solve issue memory corruption and
freezes with non-dma-aligned URB transfer buffers and control message setup
packets.

This patch prevents upstream rtl8192cu driver from freezing my mk802.

Signed-off-by: Jussi Kivilinna <jussi.kivilinna@mbnet.fi>
Acked-by: Hans de Goede <hdegoede@redhat.com>