healthd: move HealthServiceCommon

... to hardware/interfaces. HealthServiceCommon
becomes two separate libraries:
- libhealthservicedefault for services on vendor
- libhealthservicehealthd for healthd

Test: boots
Bug: 63702641
Change-Id: Ibc7096328bb36356cb653e542bab900cd046fe8a
diff --git a/healthd/HealthServiceHealthd.cpp b/healthd/HealthServiceHealthd.cpp
index 72a446a..5fd2597 100644
--- a/healthd/HealthServiceHealthd.cpp
+++ b/healthd/HealthServiceHealthd.cpp
@@ -20,6 +20,7 @@
 #include <android/hardware/health/1.0/IHealth.h>
 #include <android/hardware/health/1.0/types.h>
 #include <hal_conversion.h>
+#include <health2/service.h>
 #include <healthd/healthd.h>
 #include <hidl/HidlTransportSupport.h>
 
@@ -86,3 +87,7 @@
 
     return logthis;
 }
+
+int main() {
+    return health_service_main("backup");
+}