Extra argument to IPMI parsers

This commit adds an option to the invocation of IPMI
MRW parsers within the IBM layer to allow them to
parse an incomplete MRW.

The extra option is only enabled for the Rainier machine.

Tested:
I updated rainier.conf to point to the in progress Rainier
MRW and made sure that with the new option in the recipe, the
IPMI parsers no longer complained about a broken MRW.

Signed-off-by: Santosh Puranik <santosh.puranik@in.ibm.com>
Change-Id: I1411c8a541b1d66aa41b48abd0d41412b06e3937
diff --git a/meta-witherspoon/conf/machine/rainier.conf b/meta-witherspoon/conf/machine/rainier.conf
index 03f2623..628a45a 100644
--- a/meta-witherspoon/conf/machine/rainier.conf
+++ b/meta-witherspoon/conf/machine/rainier.conf
@@ -21,3 +21,4 @@
     "phosphor-fan-presence-config"
 
 FLASH_SIZE = "131072"
+SKIP_BROKEN_MRW = "1"