Sync with i386. - turn on SMP in generic - add 'device atpic' - this is unconditional on i386, but certain nvidia   based systems need to disable acpi because the reference bios seems to be   hosed.  If acpi is disabled, we won't find the apic.  amd64 has the   mptable code in a seperate compile option as well. - turn sym back on, it doesn't fail to compile anymore.
Sync with i386.
- turn on SMP in generic
- add 'device atpic' - this is unconditional on i386, but certain nvidia
  based systems need to disable acpi because the reference bios seems to be
  hosed.  If acpi is disabled, we won't find the apic.  amd64 has the
  mptable code in a seperate compile option as well.
- turn sym back on, it doesn't fail to compile anymore.

Approved by: re

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