boards: nucleo_f334r8: Update to default configuration guidelines

Update nucleo_f334r8 to fit with default configuration guidelines:
- configure I2C1 as arduino i2c and spi1 as arduino spi
- reorder pinmux defintion entries to ease reading
- update yaml
- update doc

Signed-off-by: Erwan Gouriou <erwan.gouriou@linaro.org>