wifi: iwlwifi: cfg: clean up dr/br configs

We don't need the configs that won't end up being used, such as
the "br" config for discrete devices, remove them. Also remove
the module firmware for test chips, that's never needed.

For now keep the iwl_dr_mac_cfg even if it's unused, we'll add
platforms with it once we have their PCI IDs.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Miri Korenblit <miriam.rachel.korenblit@intel.com>
Link: https://patch.msgid.link/20250511195137.15e2056ec40f.I75a6ce4ad0b14d2b4413615f05523a8f62f08954@changeid