wifi: rtw89: 8852c: enable the interference cancellation of MU-MIMO on 6GHz

Enable MU-MIMO interference cancellation (MUIC) to yield expected
performance of receiving MU-MIMO packets on 6GHz.

Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/20220908051257.25353-3-pkshih@realtek.com