mboxd.bb: Remove needless protocol directive

Change-Id: Ie95402d1118fca1d6221d7ecd71a866c0b71cd60
Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
diff --git a/meta-phosphor/common/recipes-phosphor/mboxd/mboxd.bb b/meta-phosphor/common/recipes-phosphor/mboxd/mboxd.bb
index 59596eb..5e9c5f2 100644
--- a/meta-phosphor/common/recipes-phosphor/mboxd/mboxd.bb
+++ b/meta-phosphor/common/recipes-phosphor/mboxd/mboxd.bb
@@ -11,7 +11,7 @@
 
 S = "${WORKDIR}/git"
 
-SRC_URI += "git://github.com/openbmc/mboxbridge.git;protocol=https"
+SRC_URI += "git://github.com/openbmc/mboxbridge.git"
 
 SRC_URI += "file://99-aspeed-mbox.rules"
 SRC_URI += "file://99-aspeed-lpc-ctrl.rules"