mboxd: mbox device is optional

The poorly-named mboxd daemon can now operate regardless of the
presence of /dev/aspeed-mbox. Particularly, OpenPOWER OpenBMC
configurations no-longer use this interface for the HIOMAP protocol
(it is now run over IPMI instead).

Remove hard dependencies on the presence of /dev/aspeed-mbox.

Change-Id: Ic3b73964d834472ebe6883aae8661de15dea7970
Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
diff --git a/recipes-phosphor/mboxd/files/99-aspeed-mbox.rules b/recipes-phosphor/mboxd/files/99-aspeed-mbox.rules
deleted file mode 100644
index 12e90d8..0000000
--- a/recipes-phosphor/mboxd/files/99-aspeed-mbox.rules
+++ /dev/null
@@ -1 +0,0 @@
-SUBSYSTEM=="misc", KERNEL=="aspeed-mbox", TAG+="systemd"
diff --git a/recipes-phosphor/mboxd/mboxd/mboxd.service b/recipes-phosphor/mboxd/mboxd/mboxd.service
index abc97e5..c491b18 100644
--- a/recipes-phosphor/mboxd/mboxd/mboxd.service
+++ b/recipes-phosphor/mboxd/mboxd/mboxd.service
@@ -2,8 +2,6 @@
 Description=Phosphor MBOX Daemon
 BindsTo=dev-aspeed\x2dlpc\x2dctrl.device
 After=dev-aspeed\x2dlpc\x2dctrl.device
-BindsTo=dev-aspeed\x2dmbox.device
-After=dev-aspeed\x2dmbox.device
 Requires=xyz.openbmc_project.Control.Host.service
 After=xyz.openbmc_project.Control.Host.service
 
diff --git a/recipes-phosphor/mboxd/mboxd_git.bb b/recipes-phosphor/mboxd/mboxd_git.bb
index e49daa1..884446b 100644
--- a/recipes-phosphor/mboxd/mboxd_git.bb
+++ b/recipes-phosphor/mboxd/mboxd_git.bb
@@ -16,7 +16,6 @@
 
 SRC_URI += "git://github.com/openbmc/mboxbridge.git"
 
-SRC_URI += "file://99-aspeed-mbox.rules"
 SRC_URI += "file://99-aspeed-lpc-ctrl.rules"
 SRC_URI += "file://aspeed-lpc-ctrl-h.patch"
 
@@ -33,7 +32,6 @@
 
 do_install_append() {
     install -d ${D}/lib/udev/rules.d
-    install -m 0644 ${WORKDIR}/99-aspeed-mbox.rules ${D}/lib/udev/rules.d
     install -m 0644 ${WORKDIR}/99-aspeed-lpc-ctrl.rules ${D}/lib/udev/rules.d
 }