Update to newer Buildroot

Change-Id: Idc3341acfdb4076ec2cf72601dbe4ae44424f273
diff --git a/configs/czechlight_clearfog_defconfig b/configs/czechlight_clearfog_defconfig
index f569b1f..66dfeed 100644
--- a/configs/czechlight_clearfog_defconfig
+++ b/configs/czechlight_clearfog_defconfig
@@ -8,6 +8,7 @@
 BR2_STRIP_EXCLUDE_DIRS="/usr/lib/libyang /usr/lib/sysrepo"
 BR2_SSP_STRONG=y
 BR2_TOOLCHAIN_EXTERNAL=y
+BR2_TOOLCHAIN_EXTERNAL_LINARO_ARM=y
 BR2_TOOLCHAIN_EXTERNAL_GDB_SERVER_COPY=y
 BR2_TARGET_GENERIC_HOSTNAME="czechlight"
 BR2_TARGET_GENERIC_PASSWD_SHA256=y