media: atomisp: gc0310: Add error_unlock label to s_stream()

Add error_unlock label + goto error_unlock on error to remove separate
unlock-s in all the error-exit paths.

Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>