platform/x86/intel/ifs: Add missing kernel-doc entry

Document the test_num member of struct ifs_data.

Reported-by: Stephen Rothwell <[e-mail]>
Signed-off-by: Jithu Joseph <[e-mail]>
Signed-off-by: Borislav Petkov (AMD) <[e-mail]>
Acked-by: Randy Dunlap <[e-mail]>
Link: https://lore.kernel.org/lkml/[e-mail]/

drivers/platform/x86/intel/ifs/ifs.h

···
  * @status: it holds simple status pass/fail/untested
  * @scan_details: opaque scan status code from h/w
  * @cur_batch: number indicating the currently loaded test file
+ * @test_num: number indicating the test type
  */
 struct ifs_data {
 	int	integrity_cap_bit;