Use new kernel's spidev's word_delay_usecs

This is quite bleeding edge, corresponding to my kernel branch
cesnet/2018-03-07--spi-01. Note that one has to use the `--no-renames`
option when creating such a patch...

Also pull in latest cla-sysrepo and netconf-cli.

[1] https://gerrit.cesnet.cz/plugins/gitiles/github/buildroot/buildroot/+/85f11d08c387c200dbb59a8559f2ba62376689bf

Change-Id: I12575b56a0bfbf8e1fe5e9e5818cf1ba1ab3aca4
Depends-on: https://patchwork.kernel.org/project/spi-devel-general/list/?series=88941
Depends-on: https://cesnet-gerrit-czechlight/c/CzechLight/cla-sysrepo/+/1555
Depends-on: https://gerrit.cesnet.cz/c/CzechLight/cla-sysrepo/+/1555
diff --git a/board/czechlight/clearfog/linux.fragment b/board/czechlight/clearfog/linux.fragment
index 2da25d2..5d353f4 100644
--- a/board/czechlight/clearfog/linux.fragment
+++ b/board/czechlight/clearfog/linux.fragment
@@ -40,4 +40,4 @@
 CONFIG_KEYBOARD_ATKBD=N
 CONFIG_INPUT_MOUSE=N
 
-CONFIG_LOCALVERSION="-9-g0cd0cb35cf72"
+CONFIG_LOCALVERSION="-120-ga6f372bbd6fd"