mcux: readme: update patch list

add the patch that implementing the uhc_mcux

Signed-off-by: Mark Wang <yichang.wang@nxp.com>

Author: MarkWangChinese

mcux/README

@@ -70,3 +70,8 @@ Patch List:
      - mcux-sdk\docs
   4. Add RW61X device_system.cmake
   5. devices: MCXN947: Update system file to remove SDK sepecific defines
+  6. Add usb_host_mcux_drv_port.h file for using MCUX SDK USB host controller driver easily in Zephyr.
+     - usb_host_mcux_drv_port.h contains the simplified structs, enums and APIs that MCUX SDK USB host controller drivers need.
+     - Update usb_host_ehci.c and usb_host_khci.c if in Zephyr environment.
+       - Add include of usb_host_mcux_drv_port.h.
+       - Remove include of usb_host.h, usb_host_hci.h, usb_host_devices.h and usb_host_framework.h.