boards: nordic: nrf54lm20pdk: select SDC for nrf54lm20pdk board

Commit b828ce7 enabled bt_hci_sdc and disabled
bt_hci_controller, but bt_hci_controller is still the
default controller. This commit also selects
bt_hci_sdc as default controller.

Signed-off-by: Aleksandr Mirlenko <[email protected]>

Author: Mirlenko

boards/nordic/nrf54lm20pdk/nrf54lm20a_cpuapp_common.dtsi

@@ -18,7 +18,7 @@
 		zephyr,bt-c2h-uart = &uart20;
 		zephyr,flash-controller = &rram_controller;
 		zephyr,flash = &cpuapp_rram;
-		zephyr,bt-hci = &bt_hci_controller;
+		zephyr,bt-hci = &bt_hci_sdc;
 		zephyr,ieee802154 = &ieee802154;
 	};
 };