pico-imx6ul: Pass the PMIC I2C address in pmic_get()

Pass "pfuze3000@8" in pmic_get() so that the PMIC node can
be found in the devicetree.

Signed-off-by: Fabio Estevam <festevam@gmail.com>
Reviewed-by: Jaehoon Chung <jh80.chung@samsung.com>