boards: nuvoton: numaker_m2l31ki: add usbd

Add usbd test feature for the numaker_pfm_m467 board

(cherry picked from commit 7cf5dd9)

Original-Signed-off-by: Chun-Chieh Li <ccli8@nuvoton.com>
GitOrigin-RevId: 7cf5dd9
Cr-Build-Id: 8735800999481080161
Cr-Build-Url: https://cr-buildbucket.appspot.com/build/8735800999481080161
Copybot-Job-Name: zephyr-main-copybot-downstream
Change-Id: I9b9f2fa65ea0a7331bbef00ebf0302074822de96
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/zephyr/+/5892050
Commit-Queue: Fabio Baltieri <fabiobaltieri@google.com>
Reviewed-by: Fabio Baltieri <fabiobaltieri@google.com>
Tested-by: ChromeOS Prod (Robot) <chromeos-ci-prod@chromeos-bot.iam.gserviceaccount.com>
Tested-by: Fabio Baltieri <fabiobaltieri@google.com>

boards/nuvoton/numaker_m2l31ki/numaker_m2l31ki.yaml

@@ -13,4 +13,5 @@ ram: 168
 flash: 512
 supported:
   - gpio
+  - usbd
 vendor: nuvoton