[MIPS] Use reset_page_mapcount to initialize empty_zero_page usage counter. Signed-off-by: Ralf Baechle <[e-mail]>

arch/mips/mm/init.c

···
 	page = virt_to_page(empty_zero_page);
 	while (page < virt_to_page(empty_zero_page + (PAGE_SIZE << order))) {
 		set_bit(PG_reserved, &page->flags);
-		set_page_count(page, 0);
+		reset_page_mapcount(page);
 		page++;
 	}