consumerir 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; verify HAL still works

In support of b/33844934

Change-Id: I1b3b021aaa98ce99560126ddd277caa427ddf151
diff --git a/ir/1.0/default/service.cpp b/ir/1.0/default/service.cpp
index 237b2c9..10f6b7d 100644
--- a/ir/1.0/default/service.cpp
+++ b/ir/1.0/default/service.cpp
@@ -23,5 +23,5 @@
 using android::hardware::defaultPassthroughServiceImplementation;
 
 int main() {
-    return defaultPassthroughServiceImplementation<IConsumerIr>("consumerir");
+    return defaultPassthroughServiceImplementation<IConsumerIr>();
 }