Add the stmpe-adc DT node as found on Toradex T30 modules
Signed-off-by: Philippe Schenker <philippe.schenker@toradex.com>
Reviewed-by: Oleksandr Suvorov <oleksandr.suvorov@toradex.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>