op-build update 12-17-2020

Changes Included for package hostboot, branch master:
a4af0cc - Louis Stermole - 2020-12-16 - OMI train sequence update
4b46424 - Dan Crowell - 2020-12-16 - Add p9a_io_omi_prbs to istep12

Signed-off-by: hostboot <hostboot@us.ibm.com>
diff --git a/openpower/package/hostboot/Config.in b/openpower/package/hostboot/Config.in
index 78ad90a..7b78e85 100644
--- a/openpower/package/hostboot/Config.in
+++ b/openpower/package/hostboot/Config.in
@@ -25,7 +25,7 @@
 
 config BR2_HOSTBOOT_VERSION
 	string
-	default "daf8701c13ab150b8b601a814bfb89eb9b355ef3" if BR2_HOSTBOOT_LATEST_VERSION
+	default "a4af0cc2d6432eff344e28335560dd72409b4d50" if BR2_HOSTBOOT_LATEST_VERSION
 	default BR2_HOSTBOOT_CUSTOM_VERSION_VALUE \
 		if BR2_HOSTBOOT_CUSTOM_VERSION