Add command to start incoming call. DO NOT MERGE

Add start incoming call command,
add ril request: RIL_REQUEST_ANSWER to Mock Ril
Fix: rilRequestHangupWaitingOrBackground should also hang up incoming call

Change-Id: I48b8cc98ced2ee5f449d4cc212a9b8e8413b0cff
diff --git a/mock-ril/src/cpp/requests.cpp b/mock-ril/src/cpp/requests.cpp
index 8cd1bf4..d88eff8 100644
--- a/mock-ril/src/cpp/requests.cpp
+++ b/mock-ril/src/cpp/requests.cpp
@@ -421,6 +421,7 @@
     rilReqConversionMap[RIL_REQUEST_OPERATOR] = ReqWithNoData; // 22
     rilReqConversionMap[RIL_REQUEST_GET_IMEI] = ReqWithNoData; // 38
     rilReqConversionMap[RIL_REQUEST_GET_IMEISV] = ReqWithNoData; // 39
+    rilReqConversionMap[RIL_REQUEST_ANSWER] = ReqWithNoData; // 40
     rilReqConversionMap[RIL_REQUEST_QUERY_NETWORK_SELECTION_MODE] = ReqWithNoData; // 45
     rilReqConversionMap[RIL_REQUEST_SET_NETWORK_SELECTION_AUTOMATIC] = ReqWithNoData; // 46
     rilReqConversionMap[RIL_REQUEST_BASEBAND_VERSION] = ReqWithNoData; // 51