wifi: mwifiex: cleanup struct mwifiex_auto_tdls_peer

Remove set but otherwise unused 'do_setup' member of
'struct mwifiex_auto_tdls_peer'. Compile tested only.

Signed-off-by: Dmitry Antipov <dmantipov@yandex.ru>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://patch.msgid.link/20240927084317.96687-1-dmantipov@yandex.ru