meta-phosphor: Add Mailbox Daemon

Change-Id: I981ec3223ba5af71e50f11d699a3f6b5448f96c8
Signed-off-by: Cyril Bur <cyril.bur@au1.ibm.com>
Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
Signed-off-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
diff --git a/common/recipes-phosphor/mboxd/files/99-aspeed-mbox.rules b/common/recipes-phosphor/mboxd/files/99-aspeed-mbox.rules
new file mode 100644
index 0000000..144fb0f
--- /dev/null
+++ b/common/recipes-phosphor/mboxd/files/99-aspeed-mbox.rules
@@ -0,0 +1 @@
+SUBSYSTEM=="mailbox", TAG+="systemd"