mxc_v4l2_capture: fix power off when closing device

There is already a call to power_off_camera() in mxc_v4l_close(),
so delete the call to vidioc_int_s_power(). This fixes a situation
where the power is off but the driver thinks it is on still.

This should be squashed with and separated from
commit: add ar1021 touchscreen

Signed-off-by: Philip Craig <phil@blackmoth.com.au>
Signed-off-by: Troy Kisky <troy.kisky@boundarydevices.com>
board-mx6_nitrogen6x: restore imx6q_add_v4l2_output

The commit below deleted too many lines..

commit d682fa41ba5963b83988fc5ce9b7836761d5e7a2
Author: Eric Nelson <eric.nelson@boundarydevices.com>
Date:   Thu Jun 13 11:17:53 2013 -0700

    Fix adv7180 patch.

Signed-off-by: Troy Kisky <troy.kisky@boundarydevices.com>