MAINTAINERS: exclude Wi-Fi related drivers from nRF Platform

Separate entry (see `Drivers: Wi-Fi as nRF Wi-Fi`) handles
Wi-Fi related reviews. Add files-exclude to decrease noise.

Signed-off-by: Marcin Szymczyk <marcin.szymczyk@nordicsemi.no>

Author: masz-nordic

MAINTAINERS.yml

@@ -4134,6 +4134,9 @@ nRF Platforms:
     - tests/drivers/*/*nrf*/
     - snippets/nordic*/
     - tests/boards/nrf/
+  files-exclude:
+    - drivers/wifi/nrf_wifi/
+    - dts/bindings/wifi/
   labels:
     - "platform: nRF"