wifi: rtw89: usb: anchor TX URBs

wifi: rtw89: usb: anchor TX URBs

During HCI reset all pending TX URBs should be canceled.  Use anchor to
keep track of them and have an ability to cancel them synchronously.

Note however that canceling RX URBs can't be done here in
rtw89_usb_ops_reset() as it breaks driver initialization.

Found by Linux Verification Center (linuxtesting.org).

Acked-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Fedor Pchelkin <pchelkin@ispras.ru>
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Link: https://patch.msgid.link/20251104135720.321110-8-pchelkin@ispras.ru