Release 4.4.20-openpower1

v4.4.20 stable release, which includes a fix for a NVMe issue that is
important for OpenPower machines.

Signed-off-by: Joel Stanley <joel@jms.id.au>
diff --git a/openpower/configs/firenze_defconfig b/openpower/configs/firenze_defconfig
index 000b64c..49e7967 100644
--- a/openpower/configs/firenze_defconfig
+++ b/openpower/configs/firenze_defconfig
@@ -15,7 +15,7 @@
 BR2_ROOTFS_POST_BUILD_SCRIPT="../openpower/scripts/fixup-target-var ../openpower/scripts/firenze-firmware-whitelist"
 BR2_LINUX_KERNEL=y
 BR2_LINUX_KERNEL_CUSTOM_VERSION=y
-BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="4.4.19"
+BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="4.4.20"
 BR2_LINUX_KERNEL_PATCH="$(BR2_EXTERNAL)/linux"
 BR2_LINUX_KERNEL_USE_CUSTOM_CONFIG=y
 BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE="$(BR2_EXTERNAL)/configs/linux/skiroot_defconfig"