KVM: selftests: Add TEST_EXTRA memory region type for "special" memslots

And another memory region type to deal with extra, one-off memory regions,
and use the new type to manage x86's SMRAM memslot, as another step towards
taking the region type instead of the raw memslot in the physical page
allocator APIs.

Alternatively, SMRAM setup could simply use the quad-underscore API to
continue passing in the memslot, but a surprising number of tests use an
"extra" memslot for a variety of reasons.  I.e. allocating memory from one
(and exactly one) extra memslot isn't all that rare, and so should be
treated as normal behavior, not as something extraordinary, as
quad-underscore functions typically suggest.

Opportunistically add comments to document the intended usage of the types,
as the difference between DATA, TEST_DATA, and TEST_EXTRA in particular
isn't exactly obvious.

Tested-by: Itaru Kitayama <itaru.kitayama@fujitsu.com>
Tested-by: Itaru Kitayam <itaru.kitayama@fujitsu.com>
Link: https://patch.msgid.link/20260902164123.2546762-14-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

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