mrw-rev.bbclass bump version 715c97e

Do not add empty paths to output file
gen-ipmi-sel: force numeric context
Add tool to dump out all targets and attributes
Add tool to print out the inventory
Fix callout I2C path

Change-Id: I73ce303b43c1b73cb95df06ef4750c28f308074b
Signed-off-by: Andrew Geissler <geissonator@yahoo.com>
diff --git a/classes/mrw-rev.bbclass b/classes/mrw-rev.bbclass
index 72a2239..b0a6b1f 100644
--- a/classes/mrw-rev.bbclass
+++ b/classes/mrw-rev.bbclass
@@ -2,4 +2,4 @@
 MRW_API_SRCREV ?= "60c8e10cbb11768cd1ba394b35cb1d6627efec42"
 
 MRW_TOOLS_SRC_URI ?= "git://github.com/openbmc/phosphor-mrw-tools"
-MRW_TOOLS_SRCREV ?= "5dd783bfab6c73851fa31d50e6184a9511f20bcd"
+MRW_TOOLS_SRCREV ?= "715c97ea76bb6c976e57dfa899f76a7106a7c2d5"