CTS: Support KM4 in the KeyAttestationTest

Support KM4 in the KeyAttestationTest
Issue: https://partnerissuetracker.corp.google.com/u/0/issues/113147109

Test: Pass CTS:
run cts -m CtsKeystoreTestCases -t android.keystore.cts.KeyAttestationTest#testEcAttestation
run cts -m CtsKeystoreTestCases -t android.keystore.cts.KeyAttestationTest#testRsaAttestation
diff --git a/tests/tests/keystore/src/android/keystore/cts/KeyAttestationTest.java b/tests/tests/keystore/src/android/keystore/cts/KeyAttestationTest.java
index 80e28d1..6b925d4 100644
--- a/tests/tests/keystore/src/android/keystore/cts/KeyAttestationTest.java
+++ b/tests/tests/keystore/src/android/keystore/cts/KeyAttestationTest.java
@@ -690,6 +690,7 @@
 
                 case 2:
                 case 3:
+                case 4:
                     assertThat(teeEnforcedDigests, is(expectedDigests));
                     break;