sh: Free up some and document PTEL flags.
Drop _PAGE_SHARED/_PAGE_U0_SHARED and document Linux PTE encodings in
the PTEL value. Preserve the swap cache entry encoding semantics for
now, though it will need rework to free up _PAGE_WT from _PAGE_FILE.
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>
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