drm/xe/tests: Skip xe_mocs live tests on VF device

There is no point to run those tests on VFs devices as they can't
access any of the MOCS registers. Skip testing on the VF device.

  [ ] =================== xe_mocs (1 subtest) ====================
  [ ] ================ xe_live_mocs_kernel_kunit  ================
  [ ] [PASSED] 0000:4d:00.0
  [ ] [SKIPPED] 0000:4d:00.1
  [ ] ============ [PASSED] xe_live_mocs_kernel_kunit ============
  [ ] ===================== [PASSED] xe_mocs =====================
Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Reviewed-by: Jonathan Cavitt <jonathan.cavitt@intel.com>
Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240720142528.530-8-michal.wajdeczko@intel.com

drivers/gpu/drm/xe/tests/xe_mocs.c

@@ -138,6 +138,9 @@ static void xe_live_mocs_kernel_kunit(struct kunit *test)
 {
 	struct xe_device *xe = test->priv;
 
+	if (IS_SRIOV_VF(xe))
+		kunit_skip(test, "this test is N/A for VF");
+
 	mocs_kernel_test_run_device(xe);
 }
 
@@ -180,6 +183,9 @@ static void xe_live_mocs_reset_kunit(struct kunit *test)
 {
 	struct xe_device *xe = test->priv;
 
+	if (IS_SRIOV_VF(xe))
+		kunit_skip(test, "this test is N/A for VF");
+
 	mocs_reset_test_run_device(xe);
 }