tests/kernel/interrupt: Enable 'icount' for qemu_cortex_m0

This test fails when icount is disabled, so enable it

See 7bdc621 which disabled icount by
default for this platform.

(cherry picked from commit 8a86733)

Original-Signed-off-by: Keith Packard <keithp@keithp.com>
GitOrigin-RevId: 8a86733
Change-Id: I84a4af3b27cf6c94aafa6fb024f7e8aec218a026
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/zephyr/+/4806740
Commit-Queue: Fabio Baltieri <fabiobaltieri@google.com>
Tested-by: Fabio Baltieri <fabiobaltieri@google.com>
Reviewed-by: Fabio Baltieri <fabiobaltieri@google.com>
Tested-by: ChromeOS Prod (Robot) <chromeos-ci-prod@chromeos-bot.iam.gserviceaccount.com>

tests/kernel/interrupt/testcase.yaml

@@ -2,7 +2,16 @@ tests:
   arch.interrupt:
     # nios2 excluded, see #22956
     arch_exclude: nios2
+    platform_exclude: qemu_cortex_m0
     tags:
       - kernel
       - interrupt
     filter: not CONFIG_TRUSTED_EXECUTION_NONSECURE
+  arch.interrupt.qemu_cortex_m0:
+    platform_allow: qemu_cortex_m0
+    tags:
+      - kernel
+      - interrupt
+    filter: not CONFIG_TRUSTED_EXECUTION_NONSECURE
+    extra_configs:
+      - CONFIG_QEMU_ICOUNT=y