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ARROW-16477: [Packaging][RPM] Add support for Amazon Linux 2 on aarch64 (#13473)

CentOS 7 on aarch64 isn't supported because we need GCC 7 or later for the platform.
verify-release-candidate.sh doesn't verify CentOS 7 packages on aarch64.

Authored-by: Sutou Kouhei <kou@clear-code.com>
Signed-off-by: Sutou Kouhei <kou@clear-code.com>