include/linux/mm_inline.h: fold __update_lru_size() into its sole caller

include/linux/mm_inline.h: fold __update_lru_size() into its sole caller

All other references to the function were removed after commit
a892cb6b977f ("mm/vmscan.c: use update_lru_size() in update_lru_sizes()").

Link: https://lore.kernel.org/linux-mm/[email protected]/
Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Yu Zhao <[email protected]>
Reviewed-by: Alex Shi <[email protected]>
Cc: Hugh Dickins <[email protected]>
Cc: Johannes Weiner <[email protected]>
Cc: Matthew Wilcox <[email protected]>
Cc: Michal Hocko <[email protected]>
Cc: Roman Gushchin <[email protected]>
Cc: Vladimir Davydov <[email protected]>
Cc: Vlastimil Babka <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>