arm64: ptdump: Use the ptdump description from a local context

arm64: ptdump: Use the ptdump description from a local context

Rename the attributes description array to allow the parsing method
to use the description from a local context. To be able to do this,
store a pointer to the description array in the state structure. This
will allow for the later introduced callers (stage_2 ptdump) to specify
their own page table description format to the ptdump parser.

Signed-off-by: Sebastian Ene <sebastianene@google.com>
Acked-by: Will Deacon <will@kernel.org>
Link: https://lore.kernel.org/r/20240909124721.1672199-4-sebastianene@google.com
Signed-off-by: Marc Zyngier <maz@kernel.org>