KVM: selftests: Explicitly ucall pool from shared memory

Allocate the common ucall pool using vm_vaddr_alloc_shared() so that the
ucall structures will be placed in shared (unencrypted) memory for VMs
with support for protected (encrypted) memory, e.g. x86's SEV.

Cc: Paolo Bonzini <[email protected]>
Cc: Sean Christopherson <[email protected]>
Cc: Vishal Annapurve <[email protected]>
Cc: Ackerly Tng <[email protected]>
cc: Andrew Jones <[email protected]>
Cc: Tom Lendacky <[email protected]>
Cc: Michael Roth <[email protected]>
Tested-by: Carlos Bilbao <[email protected]>
Signed-off-by: Peter Gonda <[email protected]>
[sean: massage changelog]
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Sean Christopherson <[email protected]>

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