Bump mapper and rest server revisions

Fixes for freedesktop ObjectManager signal handling.
diff --git a/meta-phosphor/common/recipes-phosphor/dbus/obmc-rest.bb b/meta-phosphor/common/recipes-phosphor/dbus/obmc-rest.bb
index 19da738..05f2383 100644
--- a/meta-phosphor/common/recipes-phosphor/dbus/obmc-rest.bb
+++ b/meta-phosphor/common/recipes-phosphor/dbus/obmc-rest.bb
@@ -21,6 +21,6 @@
         git://github.com/openbmc/phosphor-rest-server \
         "
 
-SRCREV = "f481dfc6b059677d06c158a5e23cfffab56edc3f"
+SRCREV = "34cae732597fb3d4b18a23b6494efdbfeca2033b"
 
 S = "${WORKDIR}/git"