V4L/DVB (13883): gspca - m5602: Be less verbose during sensor probe

Currently all probed sensor types are emitted in the kernel log, generating unnecessary noise. Be less verbose and only report what sensor is found (if any)

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