chore(nordic): use SPI alias for trezor SPI communication selection

[no changelog]

Author: TychoVrahe

nordic/trezor/trezor-ble/boards/t3w1_revA_nrf52832.overlay

@@ -7,5 +7,9 @@
 	chosen {
 		trezor,trz-uart = &uart0;
 	};
+
+	aliases {
+		spi-master = &spi0;
+	};
 };
 

nordic/trezor/trezor-ble/src/trz_comm/spi.c

@@ -35,7 +35,7 @@
 #define LOG_MODULE_NAME trz_comm_spi
 LOG_MODULE_REGISTER(LOG_MODULE_NAME);
 
-#define MY_SPI_MASTER DT_NODELABEL(spi0)
+#define MY_SPI_MASTER DT_ALIAS(spi_master)
 
 static K_SEM_DEFINE(spi_comm_ok, 0, 1);
 static K_SEM_DEFINE(spi_can_send, 0, 1);