[ISap hidl2aidl] Compat Support

Add support for ISap in the compat shim.

Test: atest VtsHalRadioTargetTest:PerInstance/SapTest
Bug: 241969533
Change-Id: I9fe5fe194de877bcd2b85ccfa822bd6565e2dc72
Merged-In: I9fe5fe194de877bcd2b85ccfa822bd6565e2dc72
diff --git a/radio/aidl/compat/libradiocompat/commonStructs.h b/radio/aidl/compat/libradiocompat/commonStructs.h
index a4a4869..f43a599 100644
--- a/radio/aidl/compat/libradiocompat/commonStructs.h
+++ b/radio/aidl/compat/libradiocompat/commonStructs.h
@@ -28,6 +28,7 @@
 uint8_t toAidl(int8_t v);
 int8_t toAidl(uint8_t v);
 int32_t toAidl(uint32_t v);
+uint8_t toHidl(int8_t v);
 
 aidl::android::hardware::radio::RadioIndicationType toAidl(V1_0::RadioIndicationType type);
 aidl::android::hardware::radio::RadioResponseType toAidl(V1_0::RadioResponseType type);