In preparation for a subsequent patch, update vmap_pfn() calls to
explicitly request that the mapping be for decrypted access to
the memory. There's no change in functionality since the PFNs
passed to vmap_pfn() are above the shared_gpa_boundary, implicitly
producing a decrypted mapping. But explicitly requesting decrypted
allows the code to work before and after a subsequent patch
that will cause vmap_pfn() to mask the PFNs to being below the
shared_gpa_boundary. While another subsesquent patch removes the
vmap_pfn() calls entirely, this temporary tweak avoids the need
for a large patch that makes all the changes at once.
Signed-off-by: Michael Kelley<mikelley@xxxxxxxxxxxxx>
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