gatekeeper HAL uses "default" service name

The getService() and registerAsService() methods of interface objects
now have default parameters of "default" for the service name. HALs
will not have to use any service name unless they want to register
more than one service.

Test: builds

Bug: 33844934
Change-Id: I66ede7833e61d9cf255238888099aa73986b1946
diff --git a/gatekeeper/1.0/default/service.cpp b/gatekeeper/1.0/default/service.cpp
index 407cf71..5cbdafb 100644
--- a/gatekeeper/1.0/default/service.cpp
+++ b/gatekeeper/1.0/default/service.cpp
@@ -24,5 +24,5 @@
 using android::hardware::defaultPassthroughServiceImplementation;
 
 int main() {
-    return defaultPassthroughServiceImplementation<IGatekeeper>("gatekeeper");
+    return defaultPassthroughServiceImplementation<IGatekeeper>();
 }
diff --git a/gatekeeper/1.0/vts/functional/VtsHalGatekeeperV1_0TargetTest.cpp b/gatekeeper/1.0/vts/functional/VtsHalGatekeeperV1_0TargetTest.cpp
index 7da2293..bdc3956 100644
--- a/gatekeeper/1.0/vts/functional/VtsHalGatekeeperV1_0TargetTest.cpp
+++ b/gatekeeper/1.0/vts/functional/VtsHalGatekeeperV1_0TargetTest.cpp
@@ -187,7 +187,7 @@
   GatekeeperHidlTest() : uid_(0) {}
   virtual void SetUp() override {
     GatekeeperResponse rsp;
-    gatekeeper_ = IGatekeeper::getService("gatekeeper");
+    gatekeeper_ = IGatekeeper::getService();
     ASSERT_NE(nullptr, gatekeeper_.get());
     doDeleteAllUsers(rsp);
   }