arm64: dts: imx8mq: fix lcdif port node

stable inclusion
from stable-v5.10.101
commit ce3ca12c632a6b3db26ad6995cf6cbadc344cbb0
bugzilla: https://gitee.com/openeuler/kernel/issues/I5669Z

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=ce3ca12c632a6b3db26ad6995cf6cbadc344cbb0



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commit 91f6d5f1 upstream.

The port node does not have a unit-address, remove it.
This fixes the warnings:
lcd-controller@30320000: 'port' is a required property
lcd-controller@30320000: 'port@0' does not match any of the regexes:
'pinctrl-[0-9]+'

Fixes: commit d0081bd0 ("arm64: dts: imx8mq: Add NWL MIPI DSI controller")
Signed-off-by: Alexander Stein <alexander.stein@ew.tq-group.com>
Reviewed-by: Fabio Estevam <festevam@gmail.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Yu Liao <liaoyu15@huawei.com>
Reviewed-by: Wei Li <liwei391@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>