[media] tw2804: add support for the Techwell tw2804

This is based on the wis-tw2804.c driver that's part of the go7007 driver.
It has been converted to a v4l subdev driver by Volokh Konstantin, and I
made additional cleanups.
Based on work by: Volokh Konstantin <volokh84@gmail.com>

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
diff --git a/drivers/media/i2c/Makefile b/drivers/media/i2c/Makefile
index af8fb29..399050a 100644
--- a/drivers/media/i2c/Makefile
+++ b/drivers/media/i2c/Makefile
@@ -37,6 +37,7 @@
 obj-$(CONFIG_VIDEO_TVP5150) += tvp5150.o
 obj-$(CONFIG_VIDEO_TVP514X) += tvp514x.o
 obj-$(CONFIG_VIDEO_TVP7002) += tvp7002.o
+obj-$(CONFIG_VIDEO_TW2804) += tw2804.o
 obj-$(CONFIG_VIDEO_TW9903) += tw9903.o
 obj-$(CONFIG_VIDEO_CS5345) += cs5345.o
 obj-$(CONFIG_VIDEO_CS53L32A) += cs53l32a.o