Fix proguard rule for CtsCurrentApiSignatureTestCases

Test: atest CtsCurrentApiSignatureTestCases:android.signature.cts.api.current.SignatureTest#testSignature -- --abi x86_64
Bug: 201800458
Bug: 205200794
Change-Id: I5493d3283b1a5259d13fcf43f29891222e419c3b
diff --git a/proguard.flags b/proguard.flags
index 0f61524..04040a7 100644
--- a/proguard.flags
+++ b/proguard.flags
@@ -5,10 +5,10 @@
 -printusage
 
 # Keep deprecated GSM SMS API
--keepclasseswithmembers class android.telephony.gsm.SmsManager {
+-keepclasseswithmembers class android.telephony.gsm.SmsManager,android.telephony.gsm.SmsManager$* {
 public *;
 }
--keepclasseswithmembers class android.telephony.gsm.SmsMessage {
+-keepclasseswithmembers class android.telephony.gsm.SmsMessage,android.telephony.gsm.SmsMessage$* {
 public *;
 }