drivers: i2c: gpio: fix compilation
drivers: i2c: gpio: fix compilation

Fix the compilation of i2c_gpio.c after the gpio_config() syscall was
removed.

Fixes: 3632815e2e124c0c4b1ed09cd91f60ecbd2fda83

Signed-off-by: Henrik Brix Andersen <a076b11c2cc63ccdc903dbe182e1eecc3cbbc094@brixandersen.dk>

zephyrproject-rtos/zephyr,galak/zephyr,zephyrproject-rtos/zephyr,zephyrproject-rtos/zephyr,galak/zephyr,galak/zephyr,finikorg/zephyr,galak/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr,finikorg/zephyr,finikorg/zephyr,galak/zephyr