[media] flexcop-i2c: mark printk continuation lines as such

This driver has printk continuation lines for debugging purposes.

Since commit 56387331 ("Merge branch 'printk-cleanups'"),
this won't work as expected anymore. So, let's add KERN_CONT to
those lines.

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