wifi: rtl8xxxu: Support devices with 5-6 out endpoints

Handle them the same way as the devices with 3-4 USB out endpoints.
This is needed for the RTL8192FU.

Signed-off-by: Bitterblue Smith <rtl8821cerfe2@gmail.com>
Reviewed-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/ef4bc66d-84f5-4021-efd7-1787d097519c@gmail.com