audit: fix whitespace alignment in include/uapi/linux/audit.h

Fixed minor indentation inconsistencies in the audit macros
to align with standard kernel coding style using 8-character
hard tabs.

Signed-off-by: Ricardo Robaina <rrobaina@redhat.com>
[PM: fixed a space before tab issue in the patch]
Signed-off-by: Paul Moore <paul@paul-moore.com>