driver: staging: count ashmem_range into SLAB_RECLAIMBLE

Add SLAB_RECLAIM_ACCOUNT to ashmem_range cache since it has registered
shrinker, which make memAvailable more presiced.
Acked-by: Todd Kjos <tkjos@google.com>
Signed-off-by: Zhaoyang Huang <zhaoyang.huang@unisoc.com>
Link: https://lore.kernel.org/r/1608277668-3740-1-git-send-email-huangzhaoyang@gmail.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/android/ashmem.c

@@ -933,7 +933,7 @@ static int __init ashmem_init(void)
 
 	ashmem_range_cachep = kmem_cache_create("ashmem_range_cache",
 						sizeof(struct ashmem_range),
-						0, 0, NULL);
+						0, SLAB_RECLAIM_ACCOUNT, NULL);
 	if (!ashmem_range_cachep) {
 		pr_err("failed to create slab cache\n");
 		goto out_free1;