xen/balloon: remove scratch page left overs
Commit 0bb599fd (xen: remove scratch frames for ballooned pages and m2p override) removed the use of the scratch page for ballooned out pages. Remove some left over function definitions. Signed-off-by: David Vrabel <david.vrabel@citrix.com> Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
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