Rename cache flag due to gantry broken.

- rename `cache_if_source_crop_layer_only_moved` to
  `cache_when_source_crop_layer_only_moved`.
- we keep the old broken one for readability.

Bug: 305718400
Test: builds
Change-Id: I82b1275388758e7b946a310f6490e82d2bfcbd0b
diff --git a/services/surfaceflinger/surfaceflinger_flags.aconfig b/services/surfaceflinger/surfaceflinger_flags.aconfig
index 88737c1..9fc329f 100644
--- a/services/surfaceflinger/surfaceflinger_flags.aconfig
+++ b/services/surfaceflinger/surfaceflinger_flags.aconfig
@@ -92,8 +92,18 @@
   bug: "299201319"
 }
 
+# This flag is broken.
+# See alternative one: cache_when_source_crop_layer_only_moved
+# flag {
+#   name: "cache_if_source_crop_layer_only_moved"
+#   namespace: "core_graphics"
+#   description: "do not flatten layers if source crop is only moved"
+#   bug: "305718400"
+#   is_fixed_read_only: true
+# }
+
 flag {
-  name: "cache_if_source_crop_layer_only_moved"
+  name: "cache_when_source_crop_layer_only_moved"
   namespace: "core_graphics"
   description: "do not flatten layers if source crop is only moved"
   bug: "305718400"