mm: Remove tlb_flush_reason::NR_TLB_FLUSH_REASONS from <linux/mm_types.h>

This has been unused since it was added 11 years ago in:

  d17d8f9 ("x86/mm: Add tracepoints for TLB flushes")

Signed-off-by: Tal Zussman <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>
Reviewed-by: Rik van Riel <[email protected]>
Acked-by: David Hildenbrand <[email protected]>
Link: https://patch.msgid.link/[email protected]

Author: tzussman

include/linux/mm_types.h

@@ -1631,7 +1631,6 @@ enum tlb_flush_reason {
 	TLB_LOCAL_MM_SHOOTDOWN,
 	TLB_REMOTE_SEND_IPI,
 	TLB_REMOTE_WRONG_CPU,
-	NR_TLB_FLUSH_REASONS,
 };
 
 /**