hack: redpine: remove locking from rsi_send_aggr_params_frame()

trying to work around the following situation when resuming from suspend:

[  846.920253] INFO: task kworker/u8:19:1715 blocked for more than 120 seconds.
[  846.927351]       Tainted: G         C        5.15.3-librem5-00348-g1c083b116187 #680
[  846.935224] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[  846.943084] task:kworker/u8:19   state:D stack:    0 pid: 1715 ppid:     2 flags:0x00000008
[  846.943105] Workqueue: phy0 ieee80211_iface_work [mac80211]
[  846.943384] Call trace:
[  846.943388]  __switch_to+0x138/0x190
[  846.943406]  __schedule+0x288/0x6ec
[  846.943420]  schedule+0x7c/0x110
[  846.943435]  schedule_preempt_disabled+0x30/0x4c
[  846.943450]  __mutex_lock.constprop.0+0x194/0x570
[  846.943463]  __mutex_lock_slowpath+0x1c/0x30
[  846.943474]  mutex_lock+0x54/0x60
[  846.943483]  rsi_mac80211_ampdu_action+0x84/0x31c [redpine_91x]
[  846.943531]  drv_ampdu_action+0x6c/0x270 [mac80211]
[  846.943729]  ___ieee80211_start_rx_ba_session+0x3ec/0x630 [mac80211]
[  846.943922]  ieee80211_process_addba_request+0xf4/0x1a0 [mac80211]
[  846.944140]  ieee80211_iface_work+0x3ac/0x3dc [mac80211]
[  846.944335]  process_one_work+0x208/0x4bc
[  846.944349]  worker_thread+0x148/0x47c
[  846.944359]  kthread+0x15c/0x170
[  846.944369]  ret_from_fork+0x10/0x20

Closes: https://source.puri.sm/Librem5/linux-next/-/issues/384