ARM: dts: imx28-xea: Pass the 'model' property

stable inclusion
from stable-v6.6.7
commit 15eb6859de685ce0235db22f061d23bd8e71dc3b
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I8SSQ4

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=15eb6859de685ce0235db22f061d23bd8e71dc3b

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[ Upstream commit 63ef8fc9bcee6b73ca445a19a7ac6bd544723c9f ]

Per root-node.yaml, 'model' is a required property.

Pass it to fix the following dt-schema warning:

imx28-xea.dtb: /: 'model' is a required property
	from schema $id: http://devicetree.org/schemas/root-node.yaml#



Signed-off-by: Fabio Estevam <festevam@denx.de>
Fixes: 445ae16a ("ARM: dts: imx28: Add DTS description of imx28 based XEA board")
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>