mac80211: realtek: rtlwifi: add RTL8192DU support

mac80211: realtek: rtlwifi: add RTL8192DU support

Add Realtek RTL8192DU support to the rtlwifi package.
The RTL8192DU chipset is a 802.11a/b/g/n chip which supports 2.4 and 5 GHz at
up to 40 MHz channel bandwidth, three hardware variations exist:

* single MAC/ single PHY
* single MAC/ double PHY
* double MAC/ double PHY

This driver has been successully tested on a single MAC/ single PHY variant
0bda:8194 (DeLock 88540, https://www.delock.com/produkt/88540/merkmale.html)

rtl_usb: rx_max_size 15360, rx_urb_num 8, in_ep 1
rtl8192du: Driver for Realtek RTL8192DU WLAN interface
rtl8192du: Loading firmware file rtlwifi/rtl8192dufw.bin
ieee80211 phy0: Selected rate control algorithm 'rtl_rc'
usbcore: registered new interface driver rtl8192du

Supported interface modes:
* IBSS
* managed
* AP
* AP/VLAN
* monitor
* mesh point
* P2P-client
* P2P-GO

interface combinations are not supported

The new rtlwifi based driver rtl8192du has been merged in kernel v6.11.

Signed-off-by: Stefan Lippers-Hollmann <s.l-h@gmx.de>
Link: https://github.com/openwrt/openwrt/pull/16721
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>