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/hipModuleUnload.cpp

@@ -24,7 +24,7 @@ THE SOFTWARE.
 #define fileName "vcpy_isa.co"
 
 int main(){
-    hipModule module;
+    hipModule_t module;
     hipModuleLoad(&module, fileName);
     hipModuleUnload(module);
 }