Witherspoon XML revision bump

Bump the github.com/open-power/witherspoon-xml revision
to pick up:
1) LED fixes
2) fan tach wiring for presence detects

Change-Id: I8c083393f43dd8b5958cc145e5b7cd27815ce402
Signed-off-by: Matt Spinler <spinler@us.ibm.com>
diff --git a/meta-openbmc-machines/meta-openpower/meta-ibm/meta-witherspoon/conf/machine/witherspoon.conf b/meta-openbmc-machines/meta-openpower/meta-ibm/meta-witherspoon/conf/machine/witherspoon.conf
index 4254507..7a181e6 100644
--- a/meta-openbmc-machines/meta-openpower/meta-ibm/meta-witherspoon/conf/machine/witherspoon.conf
+++ b/meta-openbmc-machines/meta-openpower/meta-ibm/meta-witherspoon/conf/machine/witherspoon.conf
@@ -13,4 +13,4 @@
 require conf/machine/include/p9.inc
 
 PHOSPHOR_MRW_URI = "git://github.com/open-power/witherspoon-xml"
-PHOSPHOR_MRW_REV = "a3b74dd7d0e13bc4fec6f1de7ace3039aa6f27d4"
+PHOSPHOR_MRW_REV = "8b0fd4410c247b03fa0f8e049dd1e7c6c6a4cf1f"