tests: Bluetooth: ctrl_sw_privacy_unit: Add missing definition
tests: Bluetooth: ctrl_sw_privacy_unit: Add missing definition

Change adds missing CONFIG_BT_CTLR_FAL_SIZE definition to fix build
issue.

Signed-off-by: Marek Pieta <d27fd21839ecf9c86fcf0dd8561035831899cc5a@nordicsemi.no>

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