arm64: introduce AUDIT_ARCH_AARCH64ILP32 for ilp32

maillist inclusion
category: feature
bugzilla: 46790
CVE: NA

Reference: https://github.com/norov/linux/commits/ilp32-5.2



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syscall_get_arch() currently makes no difference between arm64 and
arm64/ilp32. Fix it by adding AUDIT_ARCH_AARCH64ILP32.

Reported-by: Andy Lutomirski <luto@amacapital.net>
Signed-off-by: Yury Norov <ynorov@marvell.com>
Signed-off-by: Xiongfeng Wang <wangxiongfeng2@huawei.com>
Acked-by: Xie XiuQi <xiexiuqi@huawei.com>
Signed-off-by: Chen Jun <chenjun102@huawei.com>