Implement RadioModem for AIDL-HIDL Telephony HAL translator

Bug: 203699028
Test: Boot and grep logcat against radiocompat
Change-Id: I670f78af2cd7a0ce0b49dfc802fd363f47d9b6a6
diff --git a/radio/aidl/compat/service/radio-compat.xml b/radio/aidl/compat/service/radio-compat.xml
index d3f4212..a7089e6 100644
--- a/radio/aidl/compat/service/radio-compat.xml
+++ b/radio/aidl/compat/service/radio-compat.xml
@@ -18,6 +18,10 @@
         <fqname>IRadioMessaging/slot1</fqname>
     </hal>
     <hal format="aidl">
+        <name>android.hardware.radio.modem</name>
+        <fqname>IRadioModem/slot1</fqname>
+    </hal>
+    <hal format="aidl">
         <name>android.hardware.radio.network</name>
         <fqname>IRadioNetwork/slot1</fqname>
     </hal>