[direct floppy] Fix problem with QEMU using 360k floppies on 1.2M drives #1733
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Adds compile-time
QEMU_STRETCH_FIX
to direct floppy driver when attempting to use floppy formats requiring track doubling. Discussed in #1731 (comment).Also reduces max errors to 6 and a driver bug when max errors exceeded.
Adds some extra printk code to ensure upcoming unneeded
fdc_busy
driver sleep removal is correct.