dbus: Use consistent prefix for dbus function symbols

Improves readability by making it easier to tell at a glance what the
symbols are affecting.

Change-Id: I00e206b6383670118232e9b5a48cfbc4be5775b8
Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
diff --git a/mboxd_dbus.c b/mboxd_dbus.c
index b1dc9ad..4a0b38f 100644
--- a/mboxd_dbus.c
+++ b/mboxd_dbus.c
@@ -340,7 +340,7 @@
 	SD_BUS_VTABLE_END
 };
 
-int init_mboxd_dbus(struct mbox_context *context)
+int mboxd_dbus_init(struct mbox_context *context)
 {
 	int rc;
 
@@ -377,7 +377,7 @@
 	return 0;
 }
 
-void free_mboxd_dbus(struct mbox_context *context)
+void mboxd_dbus_free(struct mbox_context *context)
 {
 	sd_bus_unref(context->bus);
 }