wpa_supplicant should be able to reassociate when resuming, so remove a
comment saying it can't.
Fall back to sha512 if passwd_format is not set.

MFC after:	3 days
Add the missing link back to the EEPROM firmware name.
Add in a configuration file and hints for the Engenius ENH-200.

This is an AR7240 based device with an AR9285 on-board.

I've tested the initial boot and wifi support; however at the moment
the ethernet switch driver doesn't seem to be picking up carrier on the
active ethernet port. Basic flood pinging works however, so I think
we're on the right track.

Thank you to Adrian Woodley <adrian@diskworld.com.au> for purchasing me
one of these devices to bootstrap FreeBSD-HEAD on.