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arm64: enable CONFIG_MEMORY_HOTREMOVE

Baoquan He requested to merge baoquan_he/centos-stream-9:bz2062054 into main

Bugzilla: https://bugzilla.redhat.com/2062054

Upstream: RHEL-only

This is for supporting memory hotplug on arm64.

Meanwhile, disable CONFIG_DEVICE_PRIVATE explicitly to mute the error message.

[~]$ make dist-configs
......
Processing ~/.../redhat/configs/kernel-5.14.0-aarch64-debug.config ...    
  Found unset config items, please set them to an appropriate value
  CONFIG_DEVICE_PRIVATE=n
make[1]: *** [Makefile:129: dist-configs] Error 1

Signed-off-by: Baoquan He bhe@redhat.com

Edited by Baoquan He

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