Implement clear SID API

Change-Id: I4ada55674edff32d3e39d460070e03abbf847359
diff --git a/gatekeeperd/IGateKeeperService.cpp b/gatekeeperd/IGateKeeperService.cpp
index d4ed533..f5bbbf1 100644
--- a/gatekeeperd/IGateKeeperService.cpp
+++ b/gatekeeperd/IGateKeeperService.cpp
@@ -123,6 +123,13 @@
             reply->writeInt64(sid);
             return NO_ERROR;
         }
+        case CLEAR_SECURE_USER_ID: {
+            CHECK_INTERFACE(IGateKeeperService, data, reply);
+            uint32_t uid = data.readInt32();
+            clearSecureUserId(uid);
+            reply->writeNoException();
+            return NO_ERROR;
+        }
         default:
             return BBinder::onTransact(code, data, reply, flags);
     }