mpu9250: start building "NuttX" driver for Linux and QuRT

src/lib/drivers/device/CMakeLists.txt

@@ -40,6 +40,11 @@ if (${PX4_PLATFORM} STREQUAL "nuttx")
 	if ("${CONFIG_SPI}" STREQUAL "y")
 		list(APPEND SRCS_PLATFORM nuttx/SPI.cpp)
 	endif()
+elseif((${PX4_PLATFORM} MATCHES "qurt"))
+	list(APPEND SRCS_PLATFORM
+		qurt/I2C.cpp
+		qurt/SPI.cpp
+	)
 elseif(UNIX AND NOT APPLE AND NOT (${PX4_PLATFORM} MATCHES "qurt")) #TODO: add linux PX4 platform type
 	# Linux I2Cdev and SPIdev
 	list(APPEND SRCS_PLATFORM