Implement RadioSim for AIDL-HIDL Telephony HAL translator

Bug: 203699028
Test: Boot and grep logcat against radiocompat
Change-Id: I82d27049858e578522b83811a787b259e67d00a4
diff --git a/radio/aidl/compat/libradiocompat/commonStructs.cpp b/radio/aidl/compat/libradiocompat/commonStructs.cpp
index e81562a..affd00a 100644
--- a/radio/aidl/compat/libradiocompat/commonStructs.cpp
+++ b/radio/aidl/compat/libradiocompat/commonStructs.cpp
@@ -28,6 +28,18 @@
     };
 }
 
+std::string toAidl(const hidl_string& str) {
+    return str;
+}
+
+hidl_string toHidl(const std::string& str) {
+    return str;
+}
+
+uint8_t toAidl(int8_t v) {
+    return v;
+}
+
 aidl::RadioIndicationType toAidl(V1_0::RadioIndicationType type) {
     return aidl::RadioIndicationType(type);
 }