arm64: Add audit support

On AArch64, audit is supported through generic lib/audit.c and
compat_audit.c, and so this patch adds arch specific definitions required.

Acked-by Will Deacon <will.deacon@arm.com>
Acked-by: Richard Guy Briggs <rgb@redhat.com>
Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Git-commit: 875cbf3e4614cfdcc7f65033e25292aec80f09c0
Git-repo: https://www.codeaurora.org/cgit/quic/la/kernel/msm


Change-Id: I3949449b9a61a5ce23c313251e3685462f461872
Signed-off-by: Ravi Kumar Siddojigari <rsiddoji@codeaurora.org>
Signed-off-by: Nirmal Abraham <nabrah@codeaurora.org>