boards: Add board config defines to adc test
boards: Add board config defines to adc test

The test_adc.c still have hardcoded information on a board basis,
that need to be added manually.

Signed-off-by: Steffen Jahnke <d90e333c7a4606f83bff825977695eafa3d9ac9e@eu.panasonic.com>

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