meta-facebook: enable Busybox wall for flashy

The `flashy` utility expects `wall` to be present.

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: Ie765bc47f1e872f34ae092cfb0a57ef88ab17f87
diff --git a/meta-facebook/recipes-core/busybox/busybox/wall.cfg b/meta-facebook/recipes-core/busybox/busybox/wall.cfg
new file mode 100644
index 0000000..fbbaf02
--- /dev/null
+++ b/meta-facebook/recipes-core/busybox/busybox/wall.cfg
@@ -0,0 +1 @@
+CONFIG_WALL=y