iwlwifi: remove usage of orig_flags

This is a private flag, internal to cfg80211. cfg80211
will set orig_* stuff internally upon wiphy registration,
drivers do not need to muck with it.

Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com>
Acked-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>