KVM: s390: pv: destroy the configuration before its memory

Move the Destroy Secure Configuration UVC before the loop to destroy
the memory. If the protected VM has memory, it will be cleaned up and
made accessible by the Destroy Secure Configuration UVC. The struct
page for the relevant pages will still have the protected bit set, so
the loop is still needed to clean that up.

Switching the order of those two operations does not change the
outcome, but it is significantly faster.

Signed-off-by: Claudio Imbrenda <[email protected]>
Reviewed-by: Nico Boehr <[email protected]>
Reviewed-by: Janosch Frank <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Message-Id: <[email protected]>
Signed-off-by: Janosch Frank <[email protected]>

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