ITE: drivers/i2c/target: Introduce I2C target transfer using PIO mode

Introduce I2C target transfer using the PIO mode. Add an option
"target-pio-mode" in the yaml file, determined by the DTS, to dictate
whether I2C target transfer uses the PIO mode.

Signed-off-by: Tim Lin <tim2.lin@ite.corp-partner.google.com>
3 files changed