[media] video/Kconfig: Fix mis-classified devices

The helper chips are classified by their function. Unfortunaltely,
with time, developers added their stuff into the wrong places.

Fix it by moving itens to be at the right place. Also add a new
category for sensors and for misc devices that are found only on
a certain specific board.

While here, fix two bad whitespaces at Kconfig.

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>