light 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: I042320d62f88ba9585ee05f33fe7592b5ffa1884
diff --git a/light/2.0/default/service.cpp b/light/2.0/default/service.cpp
index b3848e9..70ae565 100644
--- a/light/2.0/default/service.cpp
+++ b/light/2.0/default/service.cpp
@@ -23,5 +23,5 @@
 using android::hardware::defaultPassthroughServiceImplementation;
 
 int main() {
-    return defaultPassthroughServiceImplementation<ILight>("light");
+    return defaultPassthroughServiceImplementation<ILight>();
 }
diff --git a/light/2.0/vts/functional/light_hidl_hal_test.cpp b/light/2.0/vts/functional/light_hidl_hal_test.cpp
index 9b9f543..71a8b4e 100644
--- a/light/2.0/vts/functional/light_hidl_hal_test.cpp
+++ b/light/2.0/vts/functional/light_hidl_hal_test.cpp
@@ -34,15 +34,13 @@
 using ::android::hardware::Void;
 using ::android::sp;
 
-#define LIGHT_SERVICE_NAME "light"
-
 #define ASSERT_OK(ret) ASSERT_TRUE(ret.isOk())
 #define EXPECT_OK(ret) EXPECT_TRUE(ret.isOk())
 
 class LightHidlTest : public ::testing::Test {
 public:
     virtual void SetUp() override {
-        light = ILight::getService(LIGHT_SERVICE_NAME);
+        light = ILight::getService();
 
         ASSERT_NE(light, nullptr);
         LOG(INFO) << "Test is remote " << light->isRemote();