Make the avarage-samples property a general touchscreen property
rather than imx6ul device specific.
Signed-off-by: NGuy Shapiro <guy.shapiro@mobi-wize.com>
Acked-by: NRob Herring <robh@kernel.org>
Signed-off-by: NDmitry Torokhov <dmitry.torokhov@gmail.com>