tests: drivers: i2s: i2s_additional: Enable test on nrf54lm20dk

Add overlay required to run the test on
nrf54lm20dk/nrf54lm20a/cpuapp.

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

Author: nordic-segl

tests/drivers/i2s/i2s_additional/boards/nrf54lm20pdk_nrf54lm20a_cpuapp.overlay renamed to tests/drivers/i2s/i2s_additional/boards/nrf54lm20dk_nrf54lm20a_cpuapp.overlay

@@ -16,10 +16,12 @@ tests:
       - nrf52840dk/nrf52840
       - nrf5340dk/nrf5340/cpuapp
       - nrf54l15dk/nrf54l15/cpuapp
+      - nrf54lm20dk/nrf54lm20a/cpuapp
     integration_platforms:
       - nrf52840dk/nrf52840
       - nrf5340dk/nrf5340/cpuapp
       - nrf54l15dk/nrf54l15/cpuapp
+      - nrf54lm20dk/nrf54lm20a/cpuapp
 
   drivers.i2s.additional.gpio_loopback.54h:
     harness_config: