codeowners: Add codeowners to nRF54L boards

Add entry to cover new case.

Signed-off-by: Karol Lasończyk <[email protected]>

Author: kl-cruz

CODEOWNERS

@@ -50,6 +50,7 @@
 
 # Boards
 /boards/nordic/nrf7120pdk/                @nrfconnect/ncs-co-boards @rob-robinson-14 @Hi-Im-David
+/boards/nordic/nrf54l*/                   @nrfconnect/ncs-co-boards @kl-cruz
 /boards/nordic/nrf52*                     @nrfconnect/ncs-co-boards @nrfconnect/ncs-si-bluebagel
 /boards/nordic/thingy91*                  @nrfconnect/ncs-co-boards @nrfconnect/ncs-cia
 /boards/shields/coverage_support/         @nrfconnect/ncs-low-level-test