wifi: rtw89: Add rtw8851b_hfc_param_ini_usb

"hfc" means "hci fc" which is "Host Control Interface Flow Control".
These are some parameters needed for RTL8851BU.

Signed-off-by: Bitterblue Smith <rtl8821cerfe2@gmail.com>
Acked-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Link: https://patch.msgid.link/a0dec631-de05-4302-9ef1-e730eb233f08@gmail.com