V4L/DVB: gspca - ov534: Cosmetics: fix indentation and hex digits

* Indent with tabs, not with spaces, nor with mixed style.
  * Less indentation for controls index comments.
  * Use lowercase hex digits.

Signed-off-by: Antonio Ospite <ospite@studenti.unina.it>
Signed-off-by: Jean-François Moine <moinejf@free.fr>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>