Input: cyttsp4 - SPI driver for Cypress TMA4XX touchscreen devices

Cypress TrueTouch(tm) Standard Product controllers,
Generation4 devices, SPI adapter module.

This driver adds communication support with TTSP controller
using SPI bus.

Signed-off-by: Ferruh Yigit <fery@cypress.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Javier Martinez Canillas <javier@dowhile0.org>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>