wifi: rtl8xxxu: Add separate MAC init table for RTL8192CU

wifi: rtl8xxxu: Add separate MAC init table for RTL8192CU

Until now RTL8192CU family was using the MAC init table from RTL8723AU,
but these tables are not identical in the two vendor drivers. Import
the correct table for RTL8192CU.

Also move the existing MAC init table to rtl8xxxu_8723a.c, which is
the only remaining user.

Tested with the Netcore NW362 (RTL8192CU).

Signed-off-by: Bitterblue Smith <rtl8821cerfe2@gmail.com>
Reviewed-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Link: https://msgid.link/a53ed8b9-27fc-4871-a20a-ad42c6d210d3@gmail.com