gateway: thingy91x/nrf9151/ns: remove uart0 from /chosen

uart0 is already reserved for BT HCI, so remove properties in /chosen that
reference uart0.

Signed-off-by: Marcin Niestroj <m.niestroj@emb.dev>

Author: mniestroj

gateway/boards/thingy91x_nrf9151_ns.overlay

@@ -7,6 +7,9 @@
 / {
 	chosen {
 		zephyr,bt-hci = &bt_hci_uart;
+		/delete-property/ zephyr,console;
+		/delete-property/ zephyr,shell-uart;
+		/delete-property/ zephyr,uart-mcumgr;
 	};
 };