Add the TI drv2665 piezo haptic driver.  This haptics IC requires the data
to be streamed to the FIFO for continuous output.

Datasheet can be found at:
http://www.ti.com/product/drv2665Signed-off-by: Dan Murphy <dmurphy@ti.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>