MLK-14678: dts: Fix lcd display id

MLK-14678: dts: Fix lcd display id

The default display engine used by lcd in imx6qdl-sabresd.dtsi is IPU:0
DI:0, the same used for hdmi. This is a conflict, and every time the
kernel boots, this error will be printed:
mxc_sdc_fb fb@2: ipu0-di0 already in use
mxc_sdc_fb: probe of fb@2 failed with error -16
And, of course, lcd cannot be used in parallel with hdmi.
In order to fix this, move hdmi to IPU:0 DI:1. I left lcd to IPU:0 DI:0
because it works only with that IPU core.

Signed-off-by: Robert Chiras <robert.chiras@nxp.com>