Release 4.4.70-openpower1

Move to the latest stable release for the 4.4 branch. Importantly this
picks up 'scsi: lpfc: Add shutdown method for kexec'.

Signed-off-by: Joel Stanley <joel@jms.id.au>
diff --git a/openpower/configs/garrison_defconfig b/openpower/configs/garrison_defconfig
index 32206c7..d35e0f3 100644
--- a/openpower/configs/garrison_defconfig
+++ b/openpower/configs/garrison_defconfig
@@ -42,7 +42,7 @@
 BR2_ROOTFS_POST_BUILD_SCRIPT="../openpower/scripts/fixup-target-var"
 BR2_LINUX_KERNEL=y
 BR2_LINUX_KERNEL_CUSTOM_VERSION=y
-BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="4.4.27"
+BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="4.4.70"
 BR2_KERNEL_HEADERS_4_4=y
 BR2_BINUTILS_VERSION_2_26_X=y
 BR2_LINUX_KERNEL_PATCH="$(BR2_EXTERNAL)/linux"