wifi: iwlwifi: remove dump file name extension support

wifi: iwlwifi: remove dump file name extension support

The options to configure a dump file name extension was added for 2
cases:
1. if we dump because of a missed beacon, we added the mac id and type
   to the filename.
2. to add the error id of the LMAC/UMAC/TCM/RCM error id to the file
   name.

For 1, there is a bug: in cases in which missed beacon will not trigger
a dump (for example in the default preset), and a missed beacon occurred,
and eventually there is a dump for a different reason,
the dump file name will contain the mac type and id even thought the
dump has nothing to do with a missed beacon.

Anyway, both cases are no longer required. Remove the code.

Reviewed-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Miri Korenblit <miriam.rachel.korenblit@intel.com>
Link: https://patch.msgid.link/20250826184046.d97f93fd1147.I7d0b056b6f9c38cafc53a0f29e0cf1236e2d2e8c@changeid