Input: add TI drv2665 haptics driver

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/drv2665



Signed-off-by: Dan Murphy <dmurphy@ti.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>