soc: bcm: brcmstb: Document panic notifier action and remove useless header

The panic notifier of this driver is very simple code-wise, just a
memory write to a special position with some numeric code. But this
is not clear from the semantic point-of-view, and there is no public
documentation about that either.

After discussing this in the mailing-lists [0] and having Florian
explained it very well, document that in the code for the future
generations asking the same questions. Also, while at it, remove
a useless header.

[0] https://lore.kernel.org/lkml/[email protected]

Cc: Brian Norris <[email protected]>
Cc: Doug Berger <[email protected]>
Cc: Justin Chen <[email protected]>
Cc: Lee Jones <[email protected]>
Cc: Markus Mayer <[email protected]>
Acked-by: Florian Fainelli <[email protected]>
Signed-off-by: Guilherme G. Piccoli <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Florian Fainelli <[email protected]>

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