asm-generic updates for 6.9

Just two small updates this time:

 - A series I did to unify the definition of PAGE_SIZE through Kconfig,
   intended to help with a vdso rework that needs the constant but
   cannot include the normal kernel headers when building the compat
   VDSO on arm64 and potentially others.

 - a patch from Yan Zhao to remove the pfn_to_virt() definitions from
   a couple of architectures after finding they were both incorrect
   and entirely unused.
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