xtensa: remove obsolete BKL kernel option from defconfig

The BKL doesn't exist anymore so remove CONFIG_LOCK_KERNEL.

This work was supported by a hardware donation from the CE Linux Forum.
Signed-off-by: NAlessio Igor Bogani <abogani@kernel.org>
Signed-off-by: NJiri Kosina <jkosina@suse.cz>

arch/xtensa/configs/s6105_defconfig

@@ -23,7 +23,6 @@ CONFIG_DEFCONFIG_LIST="/lib/modules/$UNAME_RELEASE/.config"
 #
 CONFIG_EXPERIMENTAL=y
 CONFIG_BROKEN_ON_SMP=y
-CONFIG_LOCK_KERNEL=y
 CONFIG_INIT_ENV_ARG_LIMIT=32
 CONFIG_LOCALVERSION=""
 CONFIG_LOCALVERSION_AUTO=y