FIFO Handling support and broken hw workaround

*) xfers based can use FIFO on FIFO capable devices
*) Prevents errors for HSI2C if FIFO is not used
*) Should co-exist with no-FIFO support h/w also
*) Implemented errenous handling of STT-STP handling on SDP2430

Signed-off-by: Nishanth Menon <menon.nishanth@gmail.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>