fix dwc3 build error

Add header file in dwc3-imx8mp.c to fix the following error:
kernel-source/drivers/usb/dwc3/dwc3-imx8mp.c:126:19:
error: 'XHCI_NO_64BIT_SUPPORT' undeclared here (not in a function)
126 | .quirks = XHCI_NO_64BIT_SUPPORT |

Signed-off-by: Jinfeng Wang <jinfeng.wang.cn@windriver.com>
Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>