Release 4.4.21-openpower1

v4.4.21 stable release, which includes a fix for the fix for the NVMe
issue that is important for OpenPower machines.

Signed-off-by: Joel Stanley <joel@jms.id.au>
(cherry picked from commit 7291da551821fb09e0f7a212b53a7990b3a97f42)
Signed-off-by: Stewart Smith <stewart@linux.vnet.ibm.com>
diff --git a/openpower/linux/0004-xhci-do-not-halt-the-secondary-HCD.patch b/openpower/linux/0004-xhci-do-not-halt-the-secondary-HCD.patch
index 4ce098a..4497720 100644
--- a/openpower/linux/0004-xhci-do-not-halt-the-secondary-HCD.patch
+++ b/openpower/linux/0004-xhci-do-not-halt-the-secondary-HCD.patch
@@ -1,4 +1,4 @@
-From 2fa1cda66612d20bc08b86298a7d9904b15d1827 Mon Sep 17 00:00:00 2001
+From 99b0645ed21b4006db3ac585df59e693cdff9745 Mon Sep 17 00:00:00 2001
 From: Joel Stanley <joel@jms.id.au>
 Date: Tue, 19 Jul 2016 22:43:26 +0930
 Subject: [PATCH 4/9] xhci: do not halt the secondary HCD