[media] tw2804: modify ADC power control

Switch off all ADC (max 4) with first init, we control it
when starting/stopping streaming.

Signed-off-by: Volokh Konstantin <volokh84@gmail.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/i2c/tw2804.c

@@ -53,6 +53,7 @@ static const u8 global_registers[] = {
 	0x3d, 0x80,
 	0x3e, 0x82,
 	0x3f, 0x82,
+	0x78, 0x0f,
 	0xff, 0xff, /* Terminator (reg 0xff does not exist) */
 };