compat: fix device_lock functions on non rt kernel

compat: fix device_lock functions on non rt kernel

CONFIG_NONE and CONFIG_PREEMPT_VOLUNTARY are not added by the last RT
patch. I have not found any references to CONFIG_NONE, probably
CONFIG_PREEMPT_NONE was meant, but that is also wrong like
CONFIG_PREEMPT_VOLUNTARY. These two options are also in the normal kernel
config system without the rt patch.

This patch only checks for KConfig options added by the rt patch, but a
rt-patch user could also select PREEMPT_NONE or PREEMPT_VOLUNTARY, and
compat-wireless will not build. I do not think this will hapen often, so leave
it like this.

This patch fixes build with all non rt-kernels.

CC: Blaise Gassend <blaise@willowgarage.com>
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>