Revert "[media] tvp5150: Fix breakage for serial usage"

This patch were a workaround for a regression at tvp5150, but
it causes troubles on devices with omap3+tvp5151 when working
in non-parallel bus mode.

Now that em28xx was fixed, we can get rid of that.

This reverts commit 47de9bf8.

Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>