Staging: epl: don't check for devfs

devfs is long dead and burried, don't check for it, as it doesn't make
any sense to do so.

Cc: Daniel Krueger <daniel.krueger@systec-electronic.com>
Cc: Ronald Sieber <Ronald.Sieber@systec-electronic.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>