iwlwifi: fix a000 RF_ID define

One of the defines has a wrong value.

Fixes: 1afb0ae4 ("iwlwifi: allow combining different phy images with mac images")
Signed-off-by: Liad Kaufman <liad.kaufman@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>