kernel: Move to Linux 4.18.16-openpower1

PowerPC fixes:

 mm: Preserve _PAGE_DEVMAP across mprotect() calls
 powerpc: Avoid code patching freed init sections
 powerpc: fix csum_ipv6_magic() on little endian platforms
 powerpc/powernv/ioda2: Reduce upper limit for DMA window size
 powerpc/kdump: Handle crashkernel memory reservation failure
 powerpc/powernv: opal_put_chars partial write fix
 powerpc/mm: Don't report PUDs as memory leaks when using kmemleak
 powerpc/powernv: Fix concurrency issue with npu->mmio_atsd_usage
 powerpc/64s: Make rfi_flush_fallback a little more robust
 powerpc: Fix size calculation using resource_size()
 powerpc/topology: Get topology for shared processors at boot
 powerpc/powernv/pci: Work around races in PCI bridge enabling
 powerpc64/ftrace: Include ftrace.h needed for enable/disable calls
 powerpc/nohash: fix pte_access_permitted()
 powerpc/64s: Fix page table fragment refcount race vs speculative references
 powerpc/fadump: handle crash memory ranges array index overflow

Signed-off-by: Joel Stanley <joel@jms.id.au>
diff --git a/openpower/linux/0002-Release-OpenPower-kernel.patch b/openpower/linux/0002-Release-OpenPower-kernel.patch
index 108a4aa..e780d57 100644
--- a/openpower/linux/0002-Release-OpenPower-kernel.patch
+++ b/openpower/linux/0002-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: Thu, 6 Sep 2018 13:27:02 +1000
+Date: Mon, 22 Oct 2018 08:22:57 +1030
 Subject: [PATCH 2/2] 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 62524f4d42ad..02a592984725 100644
+index 034dd990b0ae..78c82aea457b 100644
 --- a/Makefile
 +++ b/Makefile
 @@ -2,7 +2,7 @@
  VERSION = 4
  PATCHLEVEL = 18
- SUBLEVEL = 6
+ SUBLEVEL = 16
 -EXTRAVERSION =
 +EXTRAVERSION = -openpower1
  NAME = Merciless Moray