drivers: w1: add zephyr-gpio driver

The zephyr-gpio w1 driver introduced in this commit implements
all routines for the w1 api on top of the zephyr gpio driver.
W1 bit read, write, and reset operations are executed by
bit-banging the selected gpio.

Signed-off-by: Hudson C. Dalpra <hudson@bduncanltd.com>
10 files changed