Drop maintaing hardware feature(bug) lists for Yukon II. We don't have

Drop maintaing hardware feature(bug) lists for Yukon II. We don't have
publicly available datasheet for Yukon II and don't know what
bug/workaround exist for the specific hardware revision. Also I don't
think the vendor will release hardware errata in near future.
The hardware feature lists were not used at all except setting water
mark registers. Since msk(4) should know exact chip model/revision
number to decide which hardware capability could be used the extra
feature lists were redundant.