selftests/powerpc: Install tempfile so the subpage_prot_file test works
selftests/powerpc: Install tempfile so the subpage_prot_file test works

We forgot to install the tempfile, so when the selftests are installed
and then run the subpage_prot_file test fails.

Signed-off-by: Michael Ellerman <864f124608374e06e4da1fa5d2e47ed839b95411@ellerman.id.au>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs