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/configs/firenze_defconfig b/openpower/configs/firenze_defconfig
index 141ed0a..874246d 100644
--- a/openpower/configs/firenze_defconfig
+++ b/openpower/configs/firenze_defconfig
@@ -13,7 +13,7 @@
 BR2_ROOTFS_POST_BUILD_SCRIPT="../openpower/scripts/fixup-target-var ../openpower/scripts/firmware-whitelist"
 BR2_LINUX_KERNEL=y
 BR2_LINUX_KERNEL_CUSTOM_VERSION=y
-BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="4.18.6"
+BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="4.18.16"
 BR2_LINUX_KERNEL_PATCH="$(BR2_EXTERNAL_OP_BUILD_PATH)/linux"
 BR2_LINUX_KERNEL_USE_CUSTOM_CONFIG=y
 BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE="$(BR2_EXTERNAL_OP_BUILD_PATH)/configs/linux/skiroot_defconfig"