ANDROID: vendor_hooks: restore field in mem_cgroup

Restore field from single OEM_DATA to OEM_DATA_ARRAY to
record additional per-cgroup information for memory policy
tuning.

Bug: 413233151

See also:
Bug: 192052083
Bug: 330272526

Change-Id: Ibdeabd739af15b4dba93524573a4a83c33070356
Signed-off-by: Huan Yang <[email protected]>

Author: Huan Yang

include/linux/memcontrol.h

@@ -323,7 +323,7 @@ struct mem_cgroup {
 	spinlock_t event_list_lock;
 #endif /* CONFIG_MEMCG_V1 */
 
-	ANDROID_OEM_DATA(1);
+	ANDROID_OEM_DATA_ARRAY(1, 2);
 
 	struct mem_cgroup_per_node *nodeinfo[];
 };