samples: zephyr: subsys: usb: cdc_acm: Disable on nrf54lm20pdk

Original sample in the Zephyr repository is now executed on
final board name of nrf54lm20dk/nrf54lm20a/cpuapp.

Disable execution on obsolete nrf54lm20pdk target.

Signed-off-by: Sebastian Głąb <[email protected]>

Author: nordic-segl

samples/zephyr/subsys/usb/cdc_acm/sample.yaml

@@ -6,17 +6,10 @@ tests:
       - usb
       - ci_samples_zephyr_subsys_usb
     extra_args: CONF_FILE="usbd_next_prj.conf"
-    platform_allow:
-      - nrf54lm20pdk/nrf54lm20a/cpuapp
-      - [email protected]/nrf54lm20a/cpuapp
-      - [email protected]/nrf54lm20a/cpuapp
-      - nrf54h20dk/nrf54h20/cpuapp
-    integration_platforms:
-      - nrf54lm20pdk/nrf54lm20a/cpuapp
-      - nrf54h20dk/nrf54h20/cpuapp
+    depends_on: future_target
     harness: console
     harness_config:
-      type: one_line
+      type: multi_line
       regex:
         - "Wait for DTR"
         - "cdc_acm_echo: USBD message: CDC ACM control line state"