kernel: Move to Linux v5.0.9-openpower1

The patch titled "block: Revert v5.0 blk_mq_request_issue_directly()
changes" is now part of the stable tree so it is dropped. Note that it
was not the cause of the bug we were hunting, this is instead fixed by
disabling STRICT_KERNEL_RWX.

Signed-off-by: Joel Stanley <joel@jms.id.au>
diff --git a/openpower/configs/palmetto_defconfig b/openpower/configs/palmetto_defconfig
index 8ef70db..040592a 100644
--- a/openpower/configs/palmetto_defconfig
+++ b/openpower/configs/palmetto_defconfig
@@ -14,7 +14,7 @@
 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="5.0.7"
+BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="5.0.9"
 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"