ENGR00138130-1 input: add max11801 resistance touchscreen controller driver

ENGR00138130-1 input: add max11801 resistance touchscreen controller driver

Add MAXI max11801 resistance touch screen controller driver,
This driver use Auto Mode and Aperture Mode.

Other max1180x driver can support in this driver, they use
almost same register address and define, you can find a table in
max11801_ts.c

You can find data sheet under this link:
http://www.maxim-ic.com/datasheet/index.mvp/id/5943

Signed-off-by: Zhang Jiejing <jiejing.zhang@freescale.com>