samples: cellular: modem_shell: bt: Update to use new HCI driver

Updates required by changes in zephyr upstream for the BT HCI driver.

Signed-off-by: Tommi Rantanen <[email protected]>

Author: trantanen

samples/cellular/modem_shell/bt.overlay

@@ -8,7 +8,8 @@
 
 / {
 	chosen {
-		zephyr,bt-uart=&lpuart;
+		zephyr,bt-uart = &lpuart;
+		zephyr,bt-hci = &bt_hci_uart;
 	};
 };
 
@@ -30,6 +31,10 @@
 		status = "okay";
 		req-pin = <21>; /* <&interface_to_nrf52840 3 0>; */
 		rdy-pin = <19>; /* <&interface_to_nrf52840 2 0>; */
+		bt_hci_uart: bt_hci_uart {
+			compatible = "zephyr,bt-hci-uart";
+			status = "okay";
+		};
 	};
 };
 &uart1 {