Remove unused system command for FMUv2 config and re-enable MPU9250 driver

cmake/configs/nuttx_px4fmu-v2_default.cmake

@@ -18,7 +18,7 @@ set(config_module_list
 	drivers/boards/px4fmu-v2
 	drivers/rgbled
 	drivers/mpu6000
-	#drivers/mpu9250
+	drivers/mpu9250
 	drivers/lsm303d
 	drivers/l3gd20
 	drivers/hmc5883
@@ -54,7 +54,7 @@ set(config_module_list
 	#
 	systemcmds/bl_update
 	systemcmds/config
-	systemcmds/dumpfile
+	#systemcmds/dumpfile
 	#systemcmds/esc_calib
 	systemcmds/mixer
 	#systemcmds/motor_ramp