mrw-rev: make variable names generic

Change-Id: I23a0dcffbbd18e64d59122e9405618bef5841d56
Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
diff --git a/classes/mrw-rev.bbclass b/classes/mrw-rev.bbclass
index caaca14..0b7c432 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 ?= "d5439651a5c89c7a51038ce65c62ab8483271627"
 
-MRW_PATCH_SRC_URI ?= "git://github.com/openbmc/phosphor-mrw-tools"
-MRW_PATCH_SRCREV ?= "7b48acdb83f17a046bd042b29734a2cce5e03372"
+MRW_TOOLS_SRC_URI ?= "git://github.com/openbmc/phosphor-mrw-tools"
+MRW_TOOLS_SRCREV ?= "7b48acdb83f17a046bd042b29734a2cce5e03372"