fs: jbd/jbd2: Make state lock and journal head lock rt safe

bit_spin_locks break under RT.

Based on a previous patch from Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
--
 include/linux/buffer_head.h |    8 ++++++++
 include/linux/jbd2.h        |   24 ++++++++++++++++++++++++
 2 files changed, 32 insertions(+)