Pick up new Witherspoon MRW XML

LEDs are now in the model.

There is a Targets.pm change that must go with this that
the mrw-rev.bbclass change will get.

Because Targets.pm is common between Palmetto and Witherspoon,
the Palmetto XML must be patched to make Targets.pm happy.

Change-Id: Ic3378cca8c6ebe96870d283aac2d42d97b68358a
Signed-off-by: Matt Spinler <spinler@us.ibm.com>
diff --git a/classes/mrw-rev.bbclass b/classes/mrw-rev.bbclass
index f17afca..9e307d2 100644
--- a/classes/mrw-rev.bbclass
+++ b/classes/mrw-rev.bbclass
@@ -1,5 +1,5 @@
 MRW_API_SRC_URI ?= "git://github.com/open-power/serverwiz.git;subpath=scripts"
-MRW_API_SRCREV ?= "f98655bb1ad441d1a0036d2208ca5b6fda989a66"
+MRW_API_SRCREV ?= "31155941629988f0adcf765e7e7dd3af34fb1214"
 
 MRW_TOOLS_SRC_URI ?= "git://github.com/openbmc/phosphor-mrw-tools"
 MRW_TOOLS_SRCREV ?= "2efdcba74bc5d4be594253534069c1ea3d84aea0"