The test randomly fails on `native` due to timers being not accurate but
it cannot be otherwise. So better disable it than raising fake errors.
...
151 diff=3
150 diff=4
149 diff=3539
148 diff=4
147 diff=3
....
min/max error: 1/3539
too large difference.
Test Failed.
Timeout in expect script at "child.expect_exact("Test complete.")"
(tests/xtimer_periodic_wakeup/tests/01-run.py:22)
Added arduino-nano to BOARD_INSUFFICIENT_MEMORY/BOARD_BLACKLIST following suit
of how arduino-uno is marked, as arduino-nano is mostly an Uno in a different
form factor.
