Revert "x86/HPET: don't enable legacy replacement mode unconditionally"
This reverts commit
e680cc48b7184d3489873d6776f84ba1fc238ced.
It was committed despite multiple objections. The agreed upon fix is a
different variation of the same original patch, and the delta between the two
is far from clear.
By reverting this commit first, the fixes are clear and coherent as individual
patches, and in the appropriate form for backport to the older trees.
Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>