Bump rest, mapper and rest-dbus versions

Picking up support for pyphosphor and associations.
diff --git a/common/recipes-phosphor/rest-dbus/rest-dbus.bb b/common/recipes-phosphor/rest-dbus/rest-dbus.bb
index 1dfe027..bf25cae 100644
--- a/common/recipes-phosphor/rest-dbus/rest-dbus.bb
+++ b/common/recipes-phosphor/rest-dbus/rest-dbus.bb
@@ -21,6 +21,6 @@
         file://rest-dbus.service \
         "
 
-SRCREV = "b10a57e2f34e94b13697328cc22f876f738feb0e"
+SRCREV = "c693ba1126dcb493058d4ebeb4604b71e3bb3f08"
 
 S = "${WORKDIR}/git"