ts5x00_defconfig: switch to BR2_KERNEL_HEADERS_VERSION

In preparation for BR2_KERNEL_HEADERS_3_17 deprecation.

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

configs/ts5x00_defconfig

@@ -1,6 +1,11 @@
 BR2_i386=y
 BR2_x86_i586=y
-BR2_KERNEL_HEADERS_3_17=y
+
+# Lock headers version to match and avoid breakage
+BR2_KERNEL_HEADERS_VERSION=y
+BR2_DEFAULT_KERNEL_VERSION="3.17.8"
+BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_3_17=y
+
 BR2_TARGET_GENERIC_GETTY_PORT="ttyS1"
 BR2_ROOTFS_OVERLAY="board/ts/ts5x00/fs-overlay"
 BR2_LINUX_KERNEL=y