KVM: remove kvm_arch_gmem_prepare_needed()

KVM: remove kvm_arch_gmem_prepare_needed()

It is enough to return 0 if a guest need not do any preparation.
This is in fact how sev_gmem_prepare() works for non-SNP guests,
and it extends naturally to Intel hosts: the x86 callback for
gmem_prepare is optional and returns 0 if not defined.

Reviewed-by: Michael Roth <[email protected]>
Signed-off-by: Paolo Bonzini <[email protected]>