iwlwifi: move symbols into a separate namespace

Nobody other than iwlwifi itself should be accessing the symbols
that it exports, so make that clear by moving them into a separate
new namespace ("IWLWIFI").

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Link: https://lore.kernel.org/r/iwlwifi.20220130115024.67eba0b9867d.I6291815892746956c36489081f24f4f95b5160e4@changeid


Signed-off-by: Luca Coelho <luciano.coelho@intel.com>