AP_HAL_Linux: Bypass manual CS assertion for SPI_CS_KERNEL mode

Missed from initial patch series

Signed-off-by: John Williams <john@whelanwilliams.net>
AP_Notify: fixed example build
autotest: auto-update uavcan repo
PX4: use a common makefile for most of v1 and v2
PX4: don't build lsm303d and l3gd20 on PX4v1
AP_InertialSensor: fixed example build
AP_GPS: fixed example build
AP_Compass: fixed example build
AP_Baro: fixed example build
AP_AHRS: fixed example build
AP_Scheduler: added example sketch
AP_AHRS: fixed example build on APM2
autotest: build some examples for px4-v2
AP_GPS: check lock type before accepting position and speed information
AP_GPS: work-around for invalid time reported by PX4 GPS
Plane: mark development version 3.2.1alpha
Plane: fixed sense of landing sink rate calculation

thanks to BretC for reporting
Plane: prevent baro reset from OVERRIDE_CHAN

using OVERRIDE_CHAN would cause a baro reset as it would mean we are
temporarily disarmed, and the "reset baro and GPS when disarmed" check
would reset the baro

Now we only do the mixer update if disarmed
AP_TECS: make flare height demand consistent with height rate demand
AP_TECS: Fix bug in parameter label