Add mock modem service operations in Telephony

Bug: 205101043
Bug: 203241555
Test: manual

Change-Id: Idd1f5885d5cd198666ab56b7c8352f7d01abb612
Merged-In: Idd34e908ca625a6bf1ba9bd9a115b15315560936
diff --git a/src/com/android/phone/TelephonyShellCommand.java b/src/com/android/phone/TelephonyShellCommand.java
index 7eb3bd9..c6ee74e 100644
--- a/src/com/android/phone/TelephonyShellCommand.java
+++ b/src/com/android/phone/TelephonyShellCommand.java
@@ -323,6 +323,8 @@
             case GET_ALLOWED_NETWORK_TYPES_FOR_USER:
             case SET_ALLOWED_NETWORK_TYPES_FOR_USER:
                 return handleAllowedNetworkTypesCommand(cmd);
+            case RADIO_SUBCOMMAND:
+                return handleRadioCommand();
             default: {
                 return handleDefaultCommands(cmd);
             }