libprocessgroup: adopt cgroup v2 freezer search path am: a7148f82a1

Original change: https://android-review.googlesource.com/c/platform/system/core/+/1585102

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I0b9b318b710c5ab3f53e08489c3df8dcfc2cd663
diff --git a/libprocessgroup/include/processgroup/processgroup.h b/libprocessgroup/include/processgroup/processgroup.h
index 1cadc9f..1aaed7b 100644
--- a/libprocessgroup/include/processgroup/processgroup.h
+++ b/libprocessgroup/include/processgroup/processgroup.h
@@ -36,7 +36,8 @@
 
 static constexpr const char* CGROUPS_RC_PATH = "/dev/cgroup_info/cgroup.rc";
 // Path to test against for freezer support
-static constexpr const char* CGROUP_FREEZE_PATH = "/sys/fs/cgroup/freezer/cgroup.freeze";
+// TODO: remove and replace with a function call, see http://b/180056337
+static constexpr const char* CGROUP_FREEZE_PATH = "/sys/fs/cgroup/uid_0/cgroup.freeze";
 
 bool UsePerAppMemcg();