am33xx_tsc_adc: DTify all the drivers

Incorporate the DT changes required to get this to work.

Signed-off-by: Pantelis Antoniou <panto@antoniou-consulting.com>
lcd3-cape: Convert to using the proper touchscreen driver.

Now that the touchscreen driver has DT bindings switch to using it.

Signed-off-by: Pantelis Antoniou <panto@antoniou-consulting.com>
geiger-cape: Convert to using the new ADC driver

Now that the proper driver has DT binding convert to using it.

Signed-off-by: Pantelis Antoniou <panto@antoniou-consulting.com>