wifi: rtw88: assign mac_id for vif/sta and update to TX desc

A mac_id as an instance in firmware has to be assigned for each station
including AP and connected stations. Firmware will use the mac_id to
control TX rate and do statistics.

Assignment rule is to assign mac_id to each vif when adding vif.
For station mode, sta->mac_id will reuse vif->mac_id. For AP mode,
dynamically allocate an sta->mac_id to a station, and vif->mac_id is
used to send broadcast/multicast packets which are not belong to
a station. For example,

                  vif->mac_id      sta->mac_id
vif0 (STA mode)        0               0
vif1 (AP mode)         1               2...

By the way, remove unused RTW_BC_MC_MACID, which was planed to send
broadcast/multicast packets on fixed mac_id.

Tested-on RTL8822CE with STA + AP SCC mode.

Link: https://lore.kernel.org/linux-wireless/[email protected]/
Cc: Bitterblue Smith <[email protected]>
Signed-off-by: Ping-Ke Shih <[email protected]>
Link: https://patch.msgid.link/[email protected]

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