Parameter g6_is_space instructs the driver to map G6 keypresses
to KEY_SPACE (true) or to KEY_F18 (false). Make the parameter
configurable via module_param_cb to allow users to change its
value without reloading the module.
Signed-off-by: NDaniel M. Lambea <dmlambea@gmail.com>
Signed-off-by: NJiri Kosina <jkosina@suse.cz>