V4L/DVB (5950): whitespace cleanup for mt2131 and s5h1409

- trivial whitespace cleanups
- add "c-basic-offset: 8" to enforce tabbing style in emacs

Signed-off-by: Michael Krufky <mkrufky@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>