ARM: at91: at91sam9x5: add touchscreen support

Add touchscreen support through the ADC device.

Signed-off-by: Swapna Gurumani <swapna.gurumani@atmel.com>
Signed-off-by: Ludovic Desroches <ludovic.desroches@atmel.com>
ARM: at91: at91sam9x5: add ADC pinctrl

Signed-off-by: Ludovic Desroches <ludovic.desroches@atmel.com>
ARM: at91: at91sam9x5: add PWM pinctrl

Signed-off-by: Ludovic Desroches <ludovic.desroches@atmel.com>
ARM: at91: at91sam9x5: add missing PWM clock

Signed-off-by: Ludovic Desroches <ludovic.desroches@atmel.com>
pwm: atmel-hlcdc: fix source clk prescaler selection

Signed-off-by: Boris BREZILLON <boris.brezillon@free-electrons.com>