kdb: Implement seq_file commanddev/kdb-interrupt

Combining the kdb seq_file infrastructure with its symbolic lookups allows
a good sub-set of files held in pseudo filesystems to be displayed by
kdb. The seq_file command does exactly this and allows a significant
subset of pseudo files to be safely examined whilst debugging (and in
the hands of a brave expert an even bigger subset can be unsafely
examined).

Good arguments to try with this command include: cpuinfo_op,
gpiolib_seq_ops and vmalloc_op.

Signed-off-by: Daniel Thompson <daniel.thompson@linaro.org>

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