media: ti-vpe: cal: disable csi2 ctx and pix proc at ctx_stop

Disable CSI2 context and pix proc in cal_ctx_stop() to ensure they are
not used if the same context is used later on a different PHY or without
pix proc.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>