SPI config: use enum to specify bus

boards/intel/aerofc-v1/src/spi.cpp

@@ -37,7 +37,7 @@
 #include <nuttx/spi/spi.h>
 
 constexpr px4_spi_bus_t px4_spi_buses[SPI_BUS_MAX_BUS_ITEMS] = {
-	initSPIBus(1, {
+	initSPIBus(SPI::Bus::SPI1, {
 		initSPIDevice(DRV_IMU_DEVTYPE_MPU9250, SPI::CS{GPIO::PortA, GPIO::Pin4}),
 	}),
 };