input: Add keycode to barebox key translation table ...

Devicetrees specify the keyboard codes for the gpio-keys
driver, so add a table to translate them into something
barebox can use.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

input: add qt1070 touch keyboard support ...

use irq pin as the pin is asserted untill we clear it
This will allow to do not poll on i2c which slow down barebox

If no irq_pin is provided fall back on i2c polling

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>