FROMLIST: android: binder: Change binder_shrinker to static

(from https://patchwork.kernel.org/patch/9990321/)

binder_shrinker struct is not used anywhere outside of
binder_alloc.c and should be static.

Bug: 63926541
Change-Id: I7a13d4ddbaaf3721cddfe1d860e34c7be80dd082
Acked-by: Arve Hjønnevåg <arve@android.com>
Signed-off-by: Sherry Yang <sherryy@android.com>
diff --git a/drivers/android/binder_alloc.c b/drivers/android/binder_alloc.c
index 9057411..127d08c 100644
--- a/drivers/android/binder_alloc.c
+++ b/drivers/android/binder_alloc.c
@@ -984,7 +984,7 @@
 	return ret;
 }
 
-struct shrinker binder_shrinker = {
+static struct shrinker binder_shrinker = {
 	.count_objects = binder_shrink_count,
 	.scan_objects = binder_shrink_scan,
 	.seeks = DEFAULT_SEEKS,