linux: update to v4.2.4-openpower1

 - Rebased on upstream stable release v4.2.4
 - Upstream commit "8c24d6d7b09d usb: xhci: stop everything on the first
   call to xhci_stop" means that our patch "xhci: do not halt the
   secondary HCD" is no longer required

Signed-off-by: Joel Stanley <joel@jms.id.au>
diff --git a/openpower/linux/linux-0001-powerpc-Add-openpower_defconfig.patch b/openpower/linux/linux-0001-powerpc-Add-openpower_defconfig.patch
index 5d2a317..8ce8b7f 100644
--- a/openpower/linux/linux-0001-powerpc-Add-openpower_defconfig.patch
+++ b/openpower/linux/linux-0001-powerpc-Add-openpower_defconfig.patch
@@ -1,7 +1,7 @@
-From 2dd6f872aa2c1731e0c04b22654ee46d831626d0 Mon Sep 17 00:00:00 2001
+From 70f789b86a2daaa88e89d11e1e4c726f110094e7 Mon Sep 17 00:00:00 2001
 From: Jeremy Kerr <jk@ozlabs.org>
 Date: Fri, 12 Dec 2014 08:03:11 +0800
-Subject: [PATCH 01/18] powerpc: Add openpower_defconfig
+Subject: [PATCH 01/17] powerpc: Add openpower_defconfig
 
 Simplifies building an openpower kernel a little. It is based on the
 configuration used by the op-build openpower buildroot overlay.