tools: replace alphasort() with versionsort()

tools: replace alphasort() with versionsort()

Sorting chip names with alphasort() results in gpiochip2 coming after
gpiochip19 as it only find the lexicographic order of strings. Switching
to using versionsort() makes it look better and the order is more logical
with the numbering being taken into account.

Reviewed-by: Kent Gibson <warthog618@gmail.com>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>