tests: drivers: audio: pdm_loopback: add fixture

Added gpio_loopback fixture to pdm tests.

Signed-off-by: Michał Stasiak <[email protected]>

Author: mstasiaknordic

.github/test-spec.yml

@@ -594,6 +594,7 @@
   - "tests/drivers/lpuart/**/*"
   - "tests/drivers/pwm/**/*"
   - "tests/drivers/sensor/**/*"
+  - "tests/drivers/audio/**/*"
 
 "CI-ps-test":
   - "samples/nrf_rpc/protocols_serialization/**/*"

tests/drivers/audio/pdm_loopback/testcase.yaml

@@ -1,3 +1,10 @@
+common:
+  tags:
+    - drivers
+  harness: ztest
+  harness_config:
+    fixture: gpio_loopback
+
 tests:
   drivers.audio.pdm_loopback.nrf54l15.1000khz:
     platform_allow: