wifi: rtw89: chan: support MCC on Wi-Fi 7 chips

On Wi-Fi 7 chips, concurrent stuffs are supported by FW MRC series
(multi-role concurrent) functions. And, driver has implemented the
corresponding SW handling in patches in front of this one. Now, we
extend SW MCC (multi-channel concurrent) flow to work on Wi-Fi 7
chips.

In SW point of view, things look as below.

|  SW  |                 |  FW func      |
|      |                 |  H2C/C2H      |
--------------------------------------------
|      |              ax                 |
|      |            /----|  FW MCC func  |
|  MCC | -- chip --+                     |
|      |            \----|  FW MRC func  |
|      |              be                 |

Signed-off-by: Zong-Zhe Yang <kevin_yang@realtek.com>
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://msgid.link/20240213073514.23796-5-pkshih@realtek.com