xfs: only create event xfs_file_compat_ioctl when CONFIG_COMPAT is configure

The trace event xfs_file_compat_ioctl is only used when CONFIG_COMPAT is
configured in the build. As trace events can take up to 5K in memory for
text and meta data regardless if they are used, they should not be created
when unused. Add #ifdef CONFIG_COMPAT around the event so that it is only
created when that is configured.

Fixes: cca28fb8 ("xfs: split xfs_itrace_entry")
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Signed-off-by: Carlos Maiolino <cem@kernel.org>