drivers: media: max96717: stop the csi receiver before the source

drivers: media: max96717: stop the csi receiver before the source

Stopping the CSI source before stopping the serializer
CSI port may make the serializer not respond.
Then all the next writes to the device will fail.

max96717 1-0040: Error writing reg 0x0308: -121
max96717 1-0040: Error writing reg 0x0006: -121

Fix that by stopping the CSI receiver first and then CSI source.

Seen on max96717f revision 4.

Signed-off-by: Julien Massot <julien.massot@collabora.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>