arm64/numa: remove the limitation that cpu0 must bind to node0
1. Remove the old binding code. 2. Read the nid of cpu0 from dts. 3. Fallback the nid of cpu0 to 0 when numa=off is set in bootargs. Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
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