fstests: add commit IDs for kernel fixes already merged

A few fixes were merged into Linus' tree, so add their commit IDs in the
respective test cases.

Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: Anand Jain <asj@kernel.org>
Signed-off-by: Zorro Lang <zlang@kernel.org>