Add amd-pstate-ut to the mod-internal.list

JIRA: https://issues.redhat.com/browse/RHEL-53955
Upstream Status: RHEL-only

Signed-off-by: David Arcari <darcari@redhat.com>

Author: darcari

redhat/mod-internal.list

@@ -94,3 +94,4 @@ checksum_kunit
 arm-smmu-v3-test
 iwlwifi-tests
 sound_kunit
+amd-pstate-ut