syscalls/fanotify09: Note backport of commit e730558adffb

I backported commit e730558adffb ("fsnotify: consistent behavior for
parent not watching children") to v5.15.y and v5.10.y. Update
fanotify09 to test older LTS kernels containing that commit.

Link: https://lore.kernel.org/ltp/[email protected]/
Suggested-by: Amir Goldstein <[email protected]>
Signed-off-by: Chuck Lever <[email protected]>
Reviewed-by: Petr Vorel <[email protected]>

testcases/kernel/syscalls/fanotify/fanotify09.c

@@ -29,7 +29,6 @@
  *      7372e79c9eb9 fanotify: fix logic of reporting name info with watched parent
  *
  * Test cases #6-#7 are regression tests for commit:
- * (from v5.19, unlikely to be backported thus not in .tags):
  *
  *      e730558adffb fanotify: consistent behavior for parent not watching children
  */
@@ -380,9 +379,9 @@ static void test_fanotify(unsigned int n)
 		return;
 	}
 
-	if (tc->ignore && tst_kvercmp(5, 19, 0) < 0) {
+	if (tc->ignore && tst_kvercmp(5, 10, 0) < 0) {
 		tst_res(TCONF, "ignored mask on parent dir has undefined "
-				"behavior on kernel < 5.19");
+				"behavior on kernel < 5.10");
 		return;
 	}
 
@@ -520,6 +519,7 @@ static struct tst_test test = {
 		{"linux-git", "b469e7e47c8a"},
 		{"linux-git", "55bf882c7f13"},
 		{"linux-git", "7372e79c9eb9"},
+		{"linux-git", "e730558adffb"},
 		{}
 	}
 };