kernel: Move to Linux 4.16.13-openpower1

Notable changes: powerpc arch fixes, i40e, cxgb4, mlx5, nvme, btrfs.

Signed-off-by: Joel Stanley <joel@jms.id.au>
diff --git a/openpower/linux/0003-Release-OpenPower-kernel.patch b/openpower/linux/0003-Release-OpenPower-kernel.patch
index 2cbcb11..f840f1a 100644
--- a/openpower/linux/0003-Release-OpenPower-kernel.patch
+++ b/openpower/linux/0003-Release-OpenPower-kernel.patch
@@ -1,6 +1,6 @@
 From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
 From: Joel Stanley <joel@jms.id.au>
-Date: Mon, 28 May 2018 13:30:59 +0930
+Date: Thu, 31 May 2018 01:27:32 +0930
 Subject: [PATCH 3/3] Release OpenPower kernel
 
 Signed-off-by: Joel Stanley <joel@jms.id.au>
@@ -9,13 +9,13 @@
  1 file changed, 1 insertion(+), 1 deletion(-)
 
 diff --git a/Makefile b/Makefile
-index ded9e8480d74..c5c3d5cebec4 100644
+index 146e527a5e06..30edc0ce365f 100644
 --- a/Makefile
 +++ b/Makefile
 @@ -2,7 +2,7 @@
  VERSION = 4
  PATCHLEVEL = 16
- SUBLEVEL = 12
+ SUBLEVEL = 13
 -EXTRAVERSION =
 +EXTRAVERSION = -openpower1
  NAME = Fearless Coyote