sw64: check integrity for dtb passed by BIOS

Sunway inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I56OLG



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If kernel image is so large that it corrupts dtb, system will break
down early to give a message.

Signed-off-by: He Chuyue <hechuyue@wxiat.com>

Signed-off-by: Gu Zitao <guzitao@wxiat.com>