Cleaned up module api

- Moved HIP_INIT_API from internal to all public apis
- renamed hipLaunchModuleKernel to hipModuleLaunchKernel
- Changed tests according to the changed api

Change-Id: I822ff63c7c5b7dad340ece49456baf9d89428e9f

tests/src/hipModule.cpp

@@ -71,7 +71,7 @@ int main(){
       HIP_LAUNCH_PARAM_END
     };
 
-    hipLaunchModuleKernel(Function, 1, 1, 1, LEN, 1, 1, 0, stream, NULL, (void**)&config); 
+    hipModuleLaunchKernel(Function, 1, 1, 1, LEN, 1, 1, 0, stream, NULL, (void**)&config); 
 
     hipStreamDestroy(stream);