media: seco-cec: fix Makefile

Fix the incorrect obj-y.
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

drivers/media/platform/seco-cec/Makefile

-obj-y += seco-cec.o
+obj-$(CONFIG_VIDEO_SECO_CEC) += seco-cec.o