fifo: Make use of k_queue as implementation

This makes k_fifo functions rely on k_queue and port k_poll to use
k_queue directly.

Once all users of k_fifo migrate to k_queue this should no longer be
needed.

Change-Id: Icf16d580f88d11b2cb89e1abd23ae314f43dbd20
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
9 files changed