usb: host: xhci-plat: fix of_table.cocci warnings

Make sure (of/i2c/platform)_device_id tables are NULL terminated

Generated by: scripts/coccinelle/misc/of_table.cocci

Signed-off-by: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: Julia Lawall <julia.lawall@lip6.fr>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>