The original submittor of the quirk code noted that the errata
of a lockup creating when the condition "sector % 15 == 1" is
true only on chip revisions <= 1.  This is limitation on chip
revision is apparently not correct, therefore we apply to all
affected drives in the quirk list.

This is a sledgehammer fix, limiting max-sectors to 15.  A much better
fix would split the hardware request into two taskfiles, issuing
an additional command, thereby avoiding "sectors % 15 == 1"

Given the errata is limited to "sil 311x + <these drives>", it is hoped
that some janitor cares enough to do a real fix.