kgdb patches for 5.16

A single patch this cycle. We replace some open-coded routines to
classify task states with the scheduler's own function to do this.
Alongside the obvious benefits of removing funky code and aligning
more exactly with the scheduler's task classification, this also
fixes a long standing compiler warning by removing the open-coded
routines that generated the warning.

Signed-off-by: Daniel Thompson <daniel.thompson@linaro.org>
-----BEGIN PGP SIGNATURE-----
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=vIfI
-----END PGP SIGNATURE-----