KVM: selftests: Add APIs to override memory region types with custom memslots

Add and use APIs to override memory region types instead of open coding the
logic in tests, partly to dedup test code, but mostly to add some amount of
protection against conflicting overrides.  This will allow converting more
tests to override memory regions without taking on too much risk of bugs in
the long term, e.g. due to silently overriding a region multiple times.

Deliberately "unroll" the loops in __vm_create() and the CMMA test's
create_main_memslot() to avoid filling all memslots in anticipation of
adding an "extra" memslot that is for test use and *only* test use, i.e.
shouldn't be configured by core library code.

Converting tests to overriding memory regions will allow taking the region
type instead of the raw memslot in the physical page allocator APIs.

Tested-by: Itaru Kitayama <itaru.kitayama@fujitsu.com>
Reviewed-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com>
Acked-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Tested-by: Itaru Kitayam <itaru.kitayama@fujitsu.com>
Link: https://patch.msgid.link/20260902164123.2546762-13-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

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