Ticker interrupt priority

[Martin Galvan]

Hi everyone! We're still looking into the issue Marcos described here:

https://lists.rtems.org/pipermail/devel/2015-December/013216.html

We noticed the problem seems to go away if we set the ticker interrupt
priority to be the same as for the other interrupts. While that's not
a definitive fix, I was wondering if anyone knows why is it necessary
that the ticker interrupt has a lower priority than the rest.

Thanks!