Support new devices LS1046AFRWY and LX2160ARDB in README.
Clean up README, and add missing LS1021ATWR deploy guide.
Signed-off-by: Yangbo Lu <yangbo.lu@nxp.com>
[adjust set of devices added, update commit message/title]
Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>