ANDROID: vendor_hooks:vendor hook for mmput

add vendor hook in mmput while mm_users decreased to 0.

Bug: 238821038
Change-Id: I42a717cbeeb3176bac14b4b2391fdb2366c972d3
Signed-off-by: xiaofeng <xiaofeng5@xiaomi.com>

kernel/fork.c

@@ -1150,8 +1150,10 @@ void mmput(struct mm_struct *mm)
 {
 	might_sleep();
 
-	if (atomic_dec_and_test(&mm->mm_users))
+	if (atomic_dec_and_test(&mm->mm_users)) {
+		trace_android_vh_mmput(NULL);
 		__mmput(mm);
+	}
 }
 EXPORT_SYMBOL_GPL(mmput);