mboxd.bb: Replace phosphor-mboxd with mboxbridge

The phosphor-mboxd repo was a fork of mboxbridge and has been
archived.
Update the mboxd recipe to point to the mboxbridge which is
now the currently maintained repo.

Change-Id: I869655113be59bfb9d6ff4ac4344f89a73139b20
Signed-off-by: Adriana Kobylak <anoo@us.ibm.com>
diff --git a/recipes-phosphor/mboxd/mboxd.bb b/recipes-phosphor/mboxd/mboxd.bb
index 03428b7..bdccbdd 100644
--- a/recipes-phosphor/mboxd/mboxd.bb
+++ b/recipes-phosphor/mboxd/mboxd.bb
@@ -14,7 +14,7 @@
 
 S = "${WORKDIR}/git"
 
-SRC_URI += "git://github.com/openbmc/phosphor-mboxd.git"
+SRC_URI += "git://github.com/openbmc/mboxbridge.git"
 
 SRC_URI += "file://99-aspeed-mbox.rules"
 SRC_URI += "file://99-aspeed-lpc-ctrl.rules"