phosphor-mapper.bb: bump version

Change-Id: I3f292664544794fd49c7dd20b016b11de2a822a5
Signed-off-by: Andrew Geissler <geissonator@yahoo.com>
diff --git a/meta-phosphor/common/recipes-phosphor/dbus/phosphor-mapper.bb b/meta-phosphor/common/recipes-phosphor/dbus/phosphor-mapper.bb
index b125e9a..5e5f839 100644
--- a/meta-phosphor/common/recipes-phosphor/dbus/phosphor-mapper.bb
+++ b/meta-phosphor/common/recipes-phosphor/dbus/phosphor-mapper.bb
@@ -35,7 +35,7 @@
         "
 SRC_URI += "git://github.com/openbmc/phosphor-objmgr"
 
-SRCREV = "84e331a3095810ad9505a8a73a31819fa0f569ea"
+SRCREV = "57255f653bd9696cefc570de80fbde1c56eee17e"
 
 S = "${WORKDIR}/git"