kernel: Move to Linux v4.16.7-openpower1

Some powerpc fixes that are brought in with this release:

 cpufreq: powernv: Fix hardlockup due to synchronous smp_call in timer interrupt
 rtc: opal: Fix OPAL RTC driver OPAL_BUSY loops
 powerpc/powernv/npu: Do a PID GPU TLB flush when invalidating a large address range
 powerpc/mce: Fix a bug where mce loops on memory UE.
 powerpc/mm: Flush cache on memory hot(un)plug

Signed-off-by: Joel Stanley <joel@jms.id.au>
diff --git a/openpower/configs/pseries_defconfig b/openpower/configs/pseries_defconfig
index e64420b..d2d3cc9 100644
--- a/openpower/configs/pseries_defconfig
+++ b/openpower/configs/pseries_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="4.16.6"
+BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="4.16.7"
 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/pseries_skiroot_defconfig"