igt/params: use igt_params_set_save for igt_set_module_param*

Unify parameter access. Here switch to use debugfs/dri/N
as default for module parameters with fallback to
/sys/module/<device>/parameters.

Here is also decided 'default' device if -1 is specified as device.
Default being that device which is first to match requirements.
Default device is used only for sysfs, not for debugfs.

Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Juha-Pekka Heikkila <juhapekka.heikkila@gmail.com>
Reviewed-by: Petri Latvala <petri.latvala@intel.com>

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