libprocessgroup: Rename CgroupController -> CgroupControllerWrapper

So that the name is not overloaded with libcgrouprc_format's
CgroupController, which can be confusing.

Bug: 349105928
Test: m
Change-Id: I39df9814c500de68fd20139e661363ba51ea3543
diff --git a/libprocessgroup/processgroup.cpp b/libprocessgroup/processgroup.cpp
index 387c104..83a2258 100644
--- a/libprocessgroup/processgroup.cpp
+++ b/libprocessgroup/processgroup.cpp
@@ -94,7 +94,7 @@
 }
 
 static bool CgroupGetMemcgAppsPath(std::string* path) {
-    CgroupController controller = CgroupMap::GetInstance().FindController("memory");
+    CgroupControllerWrapper controller = CgroupMap::GetInstance().FindController("memory");
 
     if (!controller.HasValue()) {
         return false;