Witherspoon MRW XML revision bump

Pick up the change that adds the Volatile sensor.

The Volatile sensor was added in the commit prior to the
one specified in this bump, but it doesn't compile due to
an error, so need to pick up the fix for the compile error.

Part of openbmc/openbmc#2397

Change-Id: Ib2a7543e3c26d62d089fda498ec0b2991e4a3c86
Signed-off-by: Adriana Kobylak <anoo@us.ibm.com>