FROMLIST: android: binder: Add page usage in binder stats

(from https://patchwork.kernel.org/patch/9928611/)

Add the number of active, lru, and free pages for
each binder process in binder stats

Bug: 63926541
Change-Id: I12618e4eb8ecc08f4f05fe4cba454a88830897f9
Signed-off-by: Sherry Yang <sherryy@android.com>
diff --git a/drivers/android/binder.c b/drivers/android/binder.c
index f5f804c..4fc7b14 100644
--- a/drivers/android/binder.c
+++ b/drivers/android/binder.c
@@ -5426,6 +5426,8 @@
 	count = binder_alloc_get_allocated_count(&proc->alloc);
 	seq_printf(m, "  buffers: %d\n", count);
 
+	binder_alloc_print_pages(m, &proc->alloc);
+
 	count = 0;
 	binder_inner_proc_lock(proc);
 	list_for_each_entry(w, &proc->todo, entry) {