V4L/DVB (11456): gspca - m5602-po1030: Rename register defines, add missing ones.

The po1030 register defines are unnecessarily complex, simplify them and also add some missing ones.

Signed-off-by: Erik Andr?n <erik.andren@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>