V4L/DVB (9097): gspca: Adjust control values and restore compilation of sonixj.

- no compilation since last changeset
- brightness is a signed value
- better values of the color matrix

[mchehab@redhat.com: fix a merge conflict]
Signed-off-by: Jean-Francois Moine <moinejf@free.fr>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>