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Currently RISCOS_AccessPhysicalAddress allows the caller to specify the
permissions/properties of the mapped memory by directly specifying some
of the L1 page table entry flags. This will complicate things when
adding support for more page table formats, so change it so that
standard RISC OS page flags are used instead (like the alternate entry
point, RISCOS_AccessPhysicalAddressUnchecked, already uses).

Also, drop the "RISCOS_" prefix from RISCOS_AccessPhysicalAddress and
RISCOS_ReleasePhysicalAddress, and remove the references to these
routines from the HAL docs. These routines have never been exposed to
the HAL, so renaming them and removing them from the docs should make
their status clearer.

Version 6.52. Tagged as 'Kernel-6_52'