media: gspca: sq930x: use GFP_KERNEL in sd_dq_callback()

The context in which sd_dq_callback() is non atomic, there is even
msleep() at the end of the function. There is no need to use GFP_ATOMIC
here - use GFP_KERNEL instead.

Cc: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>