Rework samples using LED and GPIO to enforce use of "CONTROLLER"
as LED and PGIO postifx.
Change impact all samples that could be run by boards yet moved to
GPIO node generations, which is only STM32 for now
Signed-off-by: Erwan Gouriou <erwan.gouriou@linaro.org>
this sample expect there has a button in you board, that was
the mouse's left button, tested in linux by using evtest.
Signed-off-by: qianfan Zhao <qianfanguijin@163.com>