tests: kernel_workq: Excluding test for qemu_rx

Excluding this test for qemu_rx because it's failing randomly
Root cause not identified yet, #92213 is created to keep track
of this
This test case is working fine on actual RX HW so issue might be
in the inside the qemu environment

Signed-off-by: Duy Nguyen <duy.nguyen.xa@renesas.com>

Author: duynguyenxa

tests/kernel/workq/work/testcase.yaml

@@ -2,7 +2,11 @@ tests:
   kernel.workqueue.api:
     min_flash: 34
     tags: kernel
-    # this platform fails to run due to #40376, all
+    # hifive1 platform fails to run due to #40376, all
     # the related CI checks got blocked, so exclude it.
-    platform_exclude: hifive1
+    # qemu_rx platform fails to run due to #92213, exclude this
+    # for now until the issue is resolved.
+    platform_exclude:
+      - hifive1
+      - qemu_rx
     timeout: 80