rework NODES_SPAN_OTHER_NODES config on 5.10 kernel

[adamliyi]

The commit: a1120b0 introduced 'NODES_SPAN_OTHER_NODES' to arch/arm64/Kconfig, this does not make sense:

# git checkout linux-5.10.y
# grep NODES_SPAN_OTHER_NODES * -R
arch/arm64/Kconfig:config NODES_SPAN_OTHER_NODES

There is not code actually use NODES_SPAN_OTHER_NODES.

This patch is necessary on 5.4 kernel:

# git checkout linux-5.4.y
# grep NODES_SPAN_OTHER_NODES * -R
arch/arm64/Kconfig:config NODES_SPAN_OTHER_NODES
arch/powerpc/Kconfig:config NODES_SPAN_OTHER_NODES
arch/s390/Kconfig:config NODES_SPAN_OTHER_NODES
arch/sparc/Kconfig:config NODES_SPAN_OTHER_NODES
arch/x86/Kconfig:config NODES_SPAN_OTHER_NODES
mm/page_alloc.c:#ifdef CONFIG_NODES_SPAN_OTHER_NODES  <--------- code actually use it

From upstream commits: torvalds/linux@acd3f5c (mm: remove early_pfn_in_nid() and CONFIG_NODES_SPAN_OTHER_NODES). This config is removed since 5.8 kernel.

So we need to revert commit a1120b0