gpio: cleanup formatting, some comments; remove #if 0 block
gpio: cleanup formatting, some comments; remove #if 0 block

This patch does not alter functionality at all.  It merely cleans up
some lines (to fit in standard 80 columns), removes an #if 0 block,
and reformats a comment at the top explaining the ISR functionality;
all to improve readability.

Signed-off-by: Jon Trulson <08664b19c2d4086eb239dd8ec32d593676a5b9e4@ics.com>
Signed-off-by: Brendan Le Foll <3e0e8c4069934e8b47d99704927a85c66c0ceb33@intel.com>

jontrulson/zmraa,whbruce/zmraa,malikabhi05/zmraa-1,intel-iot-devkit/zmraa