x86, NUMA: Enable CONFIG_AMD_NUMA on 32bit too

x86, NUMA: Enable CONFIG_AMD_NUMA on 32bit too

Now that NUMA init path is unified, amdtopology can be enabled on
32bit.  Make amdtopology.c safe on 32bit by explicitly using u64 and
drop X86_64 dependency from Kconfig.

Inclusion of bootmem.h is added for max_pfn declaration.

Signed-off-by: Tejun Heo <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Yinghai Lu <[email protected]>
Cc: David Rientjes <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: "H. Peter Anvin" <[email protected]>