Remove redundant MD file/functions after the unified clock code import.

Approved by: gibbs(implicit)
oops! Revert debug cruft from r256011

Approved by: gibbs(implicit)
Make the i386 xen/pv mptable.c common for amd64/i386

Approved by: gibbs(implicit)
Glue in cpu enumeration without -DSMP. This is a shim
for until we get an MP build for amd64 pv.

Approved by: gibbs(implicit)
We now use vmem(9) instead of submaps to manage pv VA allocations.

Approved by: gibbs (implicit)