8250_pci: improve code comments and Kconfig help

[stefan . seyfried]

Hi Greg,

in order to avoid such regressions in the future, a comment in
the source and a note in the Kconfig help text might be useful

This patch is against
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty.git tty-next

Best regards,

	Stefan

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Stefan Seyfried
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