io/i2c/example: add the display IP example

Add an example program that displays the IPv4 address of the host
machine on a Grove-LCD RGB Backlight screen.

Change-Id: I01d5598d564000bf9ce491fa765962bf1c9b5b12
Reviewed-on: https://go-review.googlesource.com/22900
Reviewed-by: Johan Euphrosine <proppy@google.com>
Reviewed-by: Jaana Burcu Dogan <jbd@google.com>
1 file changed