KVM: guest_memfd: Don't set FGP_ACCESSED when getting folios

KVM: guest_memfd: Don't set FGP_ACCESSED when getting folios

guest_memfd folios don't care about accessed flags since the memory is
unevictable and there is no storage to write back to, hence, cleanup the
allocation path by not setting FGP_ACCESSED.

Signed-off-by: Ackerley Tng <ackerleytng@google.com>
[sean: split to separate patch]
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Acked-by: David Hildenbrand (arm) <david@kernel.org>
Link: https://patch.msgid.link/20260129172646.2361462-1-ackerleytng@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>