KVM: arm64: Split S1 permission evaluation into direct and hierarchical parts

The AArch64.S1DirectBasePermissions() pseudocode deals with both
direct and hierarchical S1 permission evaluation. While this is
probably convenient in the pseudocode, we would like a bit more
flexibility to slot things like indirect permissions.

To that effect, split the two permission check parts out of
handle_at_slow() and into their own functions. The permissions
are passed around as part of the walk_result structure.

Signed-off-by: Marc Zyngier <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Oliver Upton <[email protected]>

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