Add keyscan support for stih416.
It is disabled by default given that it is not enabled on all boards.
Also there are PIOs conflict with already claimed lines.
Acked-by: NSrinivas Kandagatla <srinivas.kandagatla@linaro.org>
Signed-off-by: NGiuseppe Condorelli <giuseppe.condorelli@st.com>
Signed-off-by: NGabriel Fernandez <gabriel.fernandez@linaro.org>
Signed-off-by: NMaxime Coquelin <maxime.coquelin@st.com>