sw64: dtb: check address validity with physical address

Sunway inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I5GE5X



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Due to sw64 ABI sepecification, a large kernel image may override
the data structures of UEFI BIOS.

To solve this problem, we have expanded UEFI BIOS to 1GB to make
sure that runtime service code and data structures reside in the
high address below 1GB which may be beyond ktext map. So fix it.

Signed-off-by: Yang Qiang <yangqiang@wxiat.com>

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