PX4/NuttX branch test: master

NuttX:
 - https://github.com/PX4-NuttX/nuttx/tree/master
 - PX4/NuttX@bfc153c

Changes from PX4/NuttX (PX4/NuttX@ec417d7) in current PX4/master (8709fc3)
PX4/NuttX@ec417d7...bfc153c

bfc153c (HEAD, origin/master) Fix typos in comments and documentation (#750)
9c7841a boards/sim/sim/sim/configs/ostest:  Enable cancellation tests.
13f0442 tools/zipme.sh: Improve the tool to make it usuable from a development repo and for future Apache releases.
f2e6e13 include/nuttx/wdog.h:  Add some additional comments.
402fb16 arch: arm: cxd56xx: nxstyle fixes
9029e4d Fix nxstyle issues
e264484 Remove type casting to wdentry_t (arch/)
2ca9681 Remove type casting to wdentry_t (boards/)
776e469 Remove type casting to wdentry_t (drivers/)
3cc336d Remove type casting to wdentry_t (sched/)

Apps:
 - https://github.com/PX4/NuttX-apps/tree/master
 - PX4/NuttX-apps@c6b678f

Changes from PX4/NuttX-apps (PX4/NuttX-apps@91b6ad6) in current PX4/master (8709fc3)
PX4/NuttX-apps@91b6ad6...c6b678f

c6b678fa (HEAD -> master, origin/master) netutils/dhcpc: fix nxstyle warning
70bb13ce netutils/dhcpc: configurable timeout and retry count.
d7df165c examples/udp: When a host PC is used, take its implementation of hton/ntoh functions.
dd95e357 examples/dsptest: fix nxstyle issues
7cb5bc3b (origin/px4_firmware_nuttx-8.3) wapi: fix nxstyle warning
6ab29d4f wapi: skip associate if ssid is invalid
df1d0e73 wireless/wapi: add save_config/reconnect support
6bafe90d wireless/wapi: independent scan and scan_results
7c8c3053 CI: remove the additional pull docker container step
52abe148 netutils/base64: correct the buffer type