media: m88ds3103: Add missing '\n' in log messages

Message logged by 'dev_xxx()' or 'pr_xxx()' should end with a '\n'.

While at it, change the log level from 'err' to 'debug'.

Fixes: e6089fec ("media: m88ds3103: Add support for ds3103b demod")
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>