openpower/defconfigs: update method of selecting kernel and headers

We explicitly say we want 4.4 headers due to a buildroot issue
where if we don't do that, we don't get all the HEADERS_AT_LEAST defines

Signed-off-by: Stewart Smith <stewart@linux.vnet.ibm.com>
diff --git a/openpower/configs/garrison_defconfig b/openpower/configs/garrison_defconfig
index f2e7e42..9a1c6a8 100644
--- a/openpower/configs/garrison_defconfig
+++ b/openpower/configs/garrison_defconfig
@@ -44,9 +44,8 @@
 BR2_ROOTFS_DEVICE_TABLE="../openpower/device_table.txt"
 BR2_ROOTFS_POST_BUILD_SCRIPT="../openpower/scripts/fixup-target-var"
 BR2_LINUX_KERNEL=y
-BR2_LINUX_KERNEL_SAME_AS_HEADERS=y
+BR2_LINUX_KERNEL_LATEST_VERSION=y
 BR2_KERNEL_HEADERS_4_4=y
-BR2_DEFAULT_KERNEL_HEADERS="4.4.5"
 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"