tests: drivers: watchdog: add integration platforms

Add `integration_platforms` to the watchdoc basic API testcase copy.

Signed-off-by: Stephan Linz <[email protected]>

zephyr/alt-config/tests/drivers/watchdog/wdt_basic_api/testcase.yaml

@@ -130,6 +130,8 @@ tests:
       - s32z2xxdc2@D/s32z270/rtu0
       - s32z2xxdc2@D/s32z270/rtu1
       - mr_canhubk3
+    integration_platforms:
+      - s32z2xxdc2/s32z270/rtu0
   drivers.watchdog.mimxrt1050_evk_ti_tps382x:
     filter: dt_compat_enabled("ti,tps382x")
     platform_allow: mimxrt1050_evk/mimxrt1052/hyperflash