wifi: rtw89: print just once for unknown C2H events

wifi: rtw89: print just once for unknown C2H events

When driver receives new or unknown C2H events, it print out messages
repeatedly once events are received, like

  rtw89_8922ae 0000:81:00.0: PHY c2h class 2 not support

To avoid the thousands of messages, use rtw89_info_once() instead. Also,
print out class/func for unknown (undefined) class.

Reported-by: Sean Anderson <sean.anderson@linux.dev>
Closes: https://lore.kernel.org/linux-wireless/20250729204437.164320-1-sean.anderson@linux.dev/
Reviewed-by: Sean Anderson <sean.anderson@linux.dev>
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Link: https://patch.msgid.link/20250804012234.8913-2-pkshih@realtek.com