mrw-rev.bbclass: bump version

Change-Id: I4a768d97553b005258376ace2629fbc6ba3cc18c
Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
diff --git a/classes/mrw-rev.bbclass b/classes/mrw-rev.bbclass
index 3c6e611..074be67 100644
--- a/classes/mrw-rev.bbclass
+++ b/classes/mrw-rev.bbclass
@@ -2,4 +2,4 @@
 MRW_API_SRCREV ?= "f98655bb1ad441d1a0036d2208ca5b6fda989a66"
 
 MRW_TOOLS_SRC_URI ?= "git://github.com/openbmc/phosphor-mrw-tools"
-MRW_TOOLS_SRCREV ?= "eca7f06f0a093bdda5aa650775c1b034d9870180"
+MRW_TOOLS_SRCREV ?= "18d5f5769def0e2ed070011d25c73aa9a264e3eb"