Implement reset button

[truedat101]

The configuration of SmilePlug is like this:
a total of 2 pressing button on the board,
1> SW1 for reset button, the button signal (active low) goes to CPU via GPIO58, It is designed by the software whether to assert the reset signal or not,
software will pull low signal of GPIO55 when it wishes to reset the system, its advantage is that the software has the total control of this reset button.

2>There is another SW2 for WiFi WPS which pulls low GPIO65 when pressed, It has to be programmed by software as well.