PX4 SPI default to thread locking mode

src/drivers/barometer/ms5611/ms5611_spi.cpp

@@ -124,14 +124,7 @@ MS5611_SPI::MS5611_SPI(uint8_t bus, uint32_t device, ms5611::prom_u &prom_buf) :
 int
 MS5611_SPI::init()
 {
-	int ret;
-
-#if defined(PX4_SPI_BUS_RAMTRON) && \
-	(PX4_SPI_BUS_BARO == PX4_SPI_BUS_RAMTRON)
-	SPI::set_lockmode(LOCK_THREADS);
-#endif
-
-	ret = SPI::init();
+	int ret = SPI::init();
 
 	if (ret != OK) {
 		PX4_DEBUG("SPI init failed");

src/drivers/optical_flow/pmw3901/pmw3901.cpp

@@ -341,9 +341,6 @@ PMW3901::init()
 		_yaw_rotation = (enum Rotation)val;
 	}
 
-	/* For devices competing with NuttX SPI drivers on a bus (Crazyflie SD Card expansion board) */
-	SPI::set_lockmode(LOCK_THREADS);
-
 	/* do SPI init (and probe) first */
 	if (SPI::init() != OK) {
 		goto out;