floppy: Wait for the floppy motor to reach a stable speed, after starting
When starting up the floppy motor, wait for a certain amount of time, so
that it can spin up and reach a stable speed. This delay is skipped, if the
motor was already running (which can happen, since the floppy motor is
intentionally kept spinning for 2 seconds after the previous floppy
operation completes).
Signed-off-by: Nikolay Nikolov <nickysn@users.sourceforge.net>