docs: split up serial-interfaces.rst

It never made sense to keep these documents together; move each into its
own file.

Drop the section numbering on hsi.txt on its way to its own file.

Suggested-by: Sebastian Reichel <sre@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
This commit is contained in:
Jonathan Corbet 2016-09-06 07:15:24 -06:00
commit 5e99578685
5 changed files with 190 additions and 190 deletions