powerpc/32s: Implement local_flush_tlb_page_psize()

There's a single call to local_flush_tlb_page_psize() in the code
patching code. That call is never executed on 32-bit Book3S,
because it's guarded by mm_patch_enabled() which is essentially a
radix_enabled() check, which is always false on 32s.

However depending on how the optimiser sees things it may still trip
over the BUILD_BUG() in the 32s stub of local_flush_tlb_page_psize().

To avoid that, implement it in terms of flush_range() so that if it ever
becomes called it should function, even if not optimally.

Note that flush_range() deals with page aligning the address and so on,
and that 32s doesn't support huge pages so there should be no issue with
non-standard page sizes needing to be flushed.

Signed-off-by: Michael Ellerman <[email protected]>
Link: https://msgid.link/[email protected]

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