wifi: ath11k: cleanup struct ath11k_vif

Remove set but otherwise unused 'tx_seq_no' member of 'struct ath11k_vif',
adjust 'ath11k_control_beaconing()' accordingly. This field was actually
unused since an initial commit of the driver. Compile tested only.

Signed-off-by: Dmitry Antipov <dmantipov@yandex.ru>
Acked-by: Kalle Valo <kvalo@kernel.org>
Link: https://patch.msgid.link/20241111070152.85140-1-dmantipov@yandex.ru


Signed-off-by: Jeff Johnson <quic_jjohnson@quicinc.com>