mwifiex: update tx_pkts_queued for requeued packets

wmm.tx_pkts_queued and ralist's total_pkt_count should be updated in
synchronization. They were not correctly updated in
mwifiex_send_processed_packet().

Signed-off-by: Xinming Hu <huxm@marvell.com>
Signed-off-by: Amitkumar Karwar <akarwar@marvell.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>