samples: zephyr: boards: nordic: system_off: 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/boards/nordic/system_off/boards/nrf54lm20pdk_nrf54lm20a_cpuapp.overlay

@@ -8,15 +8,10 @@ tests:
   nrf.extended.sample.boards.nrf.system_off:
     integration_platforms:
       - nrf54lv10dk/nrf54lv10a/cpuapp
-      - nrf54lm20pdk/nrf54lm20a/cpuapp
     platform_allow:
       - nrf54lv10dk/nrf54lv10a/cpuapp
       - [email protected]/nrf54lv10a/cpuapp
       - [email protected]/nrf54lv10a/cpuapp
-      - nrf54lm20pdk/nrf54lm20a/cpuapp
-      - [email protected]/nrf54lm20a/cpuapp
-      - [email protected]/nrf54lm20a/cpuapp
-      - [email protected]/nrf54lm20a/cpuapp
     harness: console
     harness_config:
       type: multi_line
@@ -28,15 +23,10 @@ tests:
   nrf.extended.sample.boards.nrf.system_off.retained_mem:
     integration_platforms:
       - nrf54lv10dk/nrf54lv10a/cpuapp
-      - nrf54lm20pdk/nrf54lm20a/cpuapp
     platform_allow:
       - nrf54lv10dk/nrf54lv10a/cpuapp
       - [email protected]/nrf54lv10a/cpuapp
       - [email protected]/nrf54lv10a/cpuapp
-      - nrf54lm20pdk/nrf54lm20a/cpuapp
-      - [email protected]/nrf54lm20a/cpuapp
-      - [email protected]/nrf54lm20a/cpuapp
-      - [email protected]/nrf54lm20a/cpuapp
     extra_configs:
       - CONFIG_APP_USE_RETAINED_MEM=y
     harness: console
@@ -55,10 +45,6 @@ tests:
       - nrf54lv10dk/nrf54lv10a/cpuapp
       - [email protected]/nrf54lv10a/cpuapp
       - [email protected]/nrf54lv10a/cpuapp
-      - nrf54lm20pdk/nrf54lm20a/cpuapp
-      - [email protected]/nrf54lm20a/cpuapp
-      - [email protected]/nrf54lm20a/cpuapp
-      - [email protected]/nrf54lm20a/cpuapp
     extra_configs:
       - CONFIG_GRTC_WAKEUP_ENABLE=y
       - CONFIG_GPIO_WAKEUP_ENABLE=n
@@ -82,10 +68,6 @@ tests:
       - nrf54lv10dk/nrf54lv10a/cpuapp
       - [email protected]/nrf54lv10a/cpuapp
       - [email protected]/nrf54lv10a/cpuapp
-      - nrf54lm20pdk/nrf54lm20a/cpuapp
-      - [email protected]/nrf54lm20a/cpuapp
-      - [email protected]/nrf54lm20a/cpuapp
-      - [email protected]/nrf54lm20a/cpuapp
     extra_configs:
       - CONFIG_APP_USE_RETAINED_MEM=y
       - CONFIG_GRTC_WAKEUP_ENABLE=y