docs: pps.txt: convert to ReST and rename to pps.rst

This file is already in a good shape: just its title and
adding some literal block markups is needed for it to be
part of the document.

While it has a small chapter with sysfs stuff, most of
the document is focused on driver development.

As it describes a kernel API, move it to the driver-api
directory.

In order to avoid conflicts, let's add an :orphan: tag
to it, to be removed when added to the driver-api book.

Signed-off-by: Mauro Carvalho Chehab <[email protected]>
Acked-by: Rodolfo Giometti <[email protected]>
Signed-off-by: Jonathan Corbet <[email protected]>

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