nitrogen6q: move OV5640 MIPI to IPU1/CSI1

This patch moves the OV5640 MIPI camera to IPU1/CSI1 to allow
it to be used concurrently with the OV5640 or OV5640 parallel
cameras.

It does this in imx6q-nitrogen6x.dts so the MIPI camera can
still be used on "-Solo" and "-Dual-Lite" processors which only
have a single IPU.

Signed-off-by: Mahyar Yaghmaee <mahyar@boundarydevices.com>