drivers: i2c: gecko: fix typo of the BUILD_ASSERT
drivers: i2c: gecko: fix typo of the BUILD_ASSERT

In the macro I2C_VALIDATE_LOC, there was a typo preventing the
compilation.

Signed-off-by: Steven Lemaire <278ad34154d48931a1fe98a95620ecd011bfd217@zii.aero>

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