arm64: stacktrace: factor out kernel unwind state

On arm64 we share some unwinding code between the regular kernel
unwinder and the KVM hyp unwinder. Some of this common code only matters
to the regular unwinder, e.g. the `kr_cur` and `task` fields in the
common struct unwind_state.

We're likely to add more state which only matters for regular kernel
unwinding (or only for hyp unwinding). In preparation for such changes,
this patch factors out the kernel-specific state into a new struct
kunwind_state, and updates the kernel unwind code accordingly.

There should be no functional change as a result of this patch.

Signed-off-by: Mark Rutland <[email protected]>
Cc: Catalin Marinas <[email protected]>
Cc: Kalesh Singh <[email protected]>
Cc: Madhavan T. Venkataraman <[email protected]>
Cc: Mark Brown <[email protected]>
Cc: Puranjay Mohan <[email protected]>
Cc: Will Deacon <[email protected]>
Reviewed-by: Puranjay Mohan <[email protected]>
Reviewed-by: Kalesh Singh <[email protected]>
Reviewed-by: Madhavan T. Venkataraman <[email protected]>
Reviewed-by: Mark Brown <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Will Deacon <[email protected]>

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