op-build update Oct 20th

Updated versions: hostboot, firestone-xml, garrison-xml

Tested on: palmetto, habanero, and firestone (boot to Petitboot only)
diff --git a/openpower/package/firestone-xml/firestone.mk b/openpower/package/firestone-xml/firestone.mk
index 3210344..d84e29c 100644
--- a/openpower/package/firestone-xml/firestone.mk
+++ b/openpower/package/firestone-xml/firestone.mk
@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-FIRESTONE_XML_VERSION ?= 4db5666e5356fbc9d612fbedb93f95a93322dcd3
+FIRESTONE_XML_VERSION ?= e7b4fa206116b93b02345234ace4c40999593578
 FIRESTONE_XML_SITE ?= $(call github,open-power,firestone-xml,$(FIRESTONE_XML_VERSION))
 
 FIRESTONE_XML_LICENSE = Apache-2.0