Filter AUX key bouncing

This patch filters AUX key bouncing. We store the state of
the AUX button and only change it when we notice that at
least AUX_TIMER_CONSECUTIVE_EVENTS consecutive equal GPIO
reads occur.

This should solve #2185 (AUX button makes interrupt storm)
but we still need the confirmation from someone affected by
the IRQ storm. In my test setup I could see an improvement
but I would only get 1 unwanted IRQ.

The next step is to use the same timer for more keys. For
that we could use the neo1973kbd_default_key_irq function
for the AUX key also.

Signed-off-by: Nelson Castillo <arhuaco@freaks-unidos.net>

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