The original code assumes that calls to PIO_ConfigureIt() are only
made once e.g. during board start-up. Hoewever, we call those
at USB SetConfiguration time, when we know which particular hardware
function we are supposed to perform. This means that after the host
has issued SetConfiguration more than a given number of times, the
code will assert() due to overflow of the static array.
Let's check if we already have allocated an array slot for a given pin
and reuse that allocated array bucket rather than allocating new ones
for the same pin.
Change-Id: I0c46d4b51eeebd58a8786d65e31e7a84e65b6a8e
Related: OS#4454
This way we can easily check with 'diff' for differences in our code and
Atmel softpack. Also, this layout is more suitable for building various
different firmware images (e.g. factory-test, dfu-loader, main
application) for a variety of different boards (simtrace, owhw, qmod).
