wifi: rtw89: mac: define internal memory address for WiFi 7 chip

Define base address of WiFi 7 internal memory according to design to
provide the same functions as existing WiFi 6 chips.

Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/20230822125822.23817-4-pkshih@realtek.com