mm: move set_pxd_safe() helpers from generic to platform

set_pxd_safe() helpers that serve a specific purpose for both x86 and
riscv platforms, do not need to be in the common memory code.  Otherwise
they just unnecessarily make the common API more complicated.  This moves
the helpers from common code to platform instead.

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Anshuman Khandual <[email protected]>
Suggested-by: David Hildenbrand <[email protected]>
Acked-by: Dave Hansen <[email protected]>
Acked-by: David Hildenbrand <[email protected]>
Cc: Paul Walmsley <[email protected]>
Cc: Palmer Dabbelt <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: David Hildenbrand <[email protected]>
Cc: Ryan Roberts <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

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