Support for 2TB of memory added

Contributed by Paul 'WEiRD' de Weerd on 2019-01-21 from the paranoid android dept.

Mike Larkin (mlarkin@) just committed support for 2TB of physical memory on the amd64 platform:

CVSROOT:        /cvs
Module name:    src
Changes by:     mlarkin@cvs.openbsd.org 2019/01/20 23:18:37

Modified files:
        sys/arch/amd64/amd64: machdep.c pmap.c 
        sys/arch/amd64/include: pmap.h 

Log message:
Support 2TB phys mem

This change expands the direct map to 4 slots (512GB each), to support
machines with up to 2TB physical memory. Should further expansion be
required, this change provides the means to do that with a single #define
change.

with help from and ok guenther

Those of you with machines with lots of memory are encouraged to try this out and report your dmesg!

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