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arm64: Add kernel variant for 64K page-sized ARM64

Donald Dutile requested to merge ddutile/centos-stream-9:arm64-64k into main

Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2153073

Upstream: RHEL only

Modify redhat/config files to create kernel-64k-.aarch64
kernel, an ARM64 kernel that has page_size set to 64K vs the
kernel-.aarch64 kernel that has a page_size of 4K.

Testing:
a) Boot tested on Ampere-based, Mt. Snow
b) Did a sysrq forced crash to verify kexec & kdump work;
ran crashdump against the crash file to check basic
crash functionality as well.

Signed-off-by: Donald Dutile ddutile@redhat.com

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