usb: gadget: udc: fsl: remove unnecessary & operation

Now that usb_endpoint_maxp() only returns the lowest
11 bits from wMaxPacketSize, we can remove the &
operation from this driver.

Cc: Li Yang <leoli@freescale.com>
Cc: <linuxppc-dev@lists.ozlabs.org>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>