tests: zephyr: kernel: timer: timer_behavior: Disable on nrf54lm20pdk

Original test 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

tests/zephyr/kernel/timer/timer_behavior/boards/nrf54lm20pdk_nrf54lm20a_cpuapp.conf

@@ -5,14 +5,9 @@ tests:
       - timer
       - ci_tests_zephyr_kernel_timer_timer_behavior
     platform_allow:
-      - nrf54lm20pdk/nrf54lm20a/cpuapp
-      - [email protected]/nrf54lm20a/cpuapp
-      - [email protected]/nrf54lm20a/cpuapp
-      - [email protected]/nrf54lm20a/cpuapp
       - nrf54lv10dk/nrf54lv10a/cpuapp
       - [email protected]/nrf54lv10a/cpuapp
       - [email protected]/nrf54lv10a/cpuapp
     integration_platforms:
-      - nrf54lm20pdk/nrf54lm20a/cpuapp
       - nrf54lv10dk/nrf54lv10a/cpuapp
     timeout: 45