KVM: Annotate that all paths in hva_to_pfn() might sleep

Now that hva_to_pfn() no longer supports being called in atomic context,
move the might_sleep() annotation from hva_to_pfn_slow() to hva_to_pfn().

Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Tested-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Tested-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-ID: <20241010182427.1434605-14-seanjc@google.com>