-properly index ECL and generated uORB

We don't want to busy loop after the poll fail if that ever happened.

We don't need to poll for vehicle commands, we will get them anyway by
doing orb_check. Also, the polling for them wasn't implemented correctly
anyway.

 -fixes #5625

MC pos control tests: added tests to all configs that include them

It was found inconvenient that auto-disarm triggers too quickly right
after arming when the vehicle has not actually taken off yet.

Therefore, the auto-disarm takes now by a factor of 5 longer if the
vehicle has not taken off yet.

FMU driver: Ensure correct binding pulses for Spektrum, time out any receiver which has more than one second no signal.

add spektrum satellite bind command to fmu

open fmu file descriptor to issue ioctl

Fix sensor rail reset on Pixracer. Increase the reset duration to 50 ms to ensure the sensor power has bled off.

 The Nuttx CAN driver is not used with UAVCAN. However to
facilitate compilation to allow the Nuttx CAN Example to be
compiled and linked, the missing proto type was needed.

Futhermore to include the NuttX CAN eaxample the following changes
are needed:

1 ) In cmake/configs/<target>.cmake
Add can to config_extra_builtin_cmds as:

set(config_extra_builtin_cmds
        serdis
        sercon
        can
        )

Add:
add_custom_target(can)
set_target_properties(can PROPERTIES
       PRIORITY "SCHED_PRIORITY_DEFAULT"
       MAIN "can" STACK_MAIN "2048"
       COMPILE_FLAGS "-Os")

2) Update the nuttx-configs/<target>/nsh/defconfig

Run make oldconfig and make menuconfig and set the follwoing:
CONFIG_CAN=y
CONFIG_STM32_CAN1=y or CONFIG_STM32_CAN2=y
CONFIG_CAN_EXTID=y
CONFIG_CAN1_BAUD=250000
CONFIG_CAN_FIFOSIZE=8
CONFIG_CAN_NPENDINGRTR=4
CONFIG_EXAMPLES_CAN=y

 Removed the commented body of the 'if CONFIG_CAN' in the appconfigs