wifi: rtw89: 8852bt: add 8852BE-VT to Makefile and Kconfig

RTL8852BE-VT is a WiFi 6 2x2 chip, which can operate on 2/5 GHz channels
and 80MHz bandwidth.

Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Link: https://patch.msgid.link/20240720021340.12102-8-pkshih@realtek.com