PX4/NuttX branch test: master

NuttX:
 - https://github.com/PX4-NuttX/nuttx/tree/master
 - PX4/NuttX@9c14b9c

Changes from PX4/NuttX (PX4/NuttX@ec417d7) in current PX4/master (0a2c48c)
PX4/NuttX@ec417d7...9c14b9c

9c14b9c (HEAD, origin/master) CI: Add macOS builds
ce3a237 Add missing entries into LICENSE and NOTICE files
dfe11b5 CI: sync with testing repo
398175b tools/zipme.sh: Add the possibility to PGP sign the final tarballs. (#756)
425e6c2 arch: xtensa: esp32: nxstyle fixes (#753)
bfc153c 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

Apps:
 - https://github.com/PX4/NuttX-apps/tree/master
 - PX4/NuttX-apps@6e96e54

Changes from PX4/NuttX-apps (PX4/NuttX-apps@91b6ad6) in current PX4/master (0a2c48c)
PX4/NuttX-apps@91b6ad6...6e96e54

6e96e54b (HEAD -> master, origin/master) CI: sync with testing repo
c6b678fa 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