include/trace/events/vmscan.h: remove mm_vmscan_inactive_list_is_low

mm_vmscan_inactive_list_is_low has no users after commit b91ac374
("mm: vmscan: enforce inactive:active ratio at the reclaim root").

Remove it.

Link: https://lkml.kernel.org/r/20210614194554.2683395-1-yuzhao@google.com


Signed-off-by: Yu Zhao <yuzhao@google.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>