zephyr: 96b_nitrogen: use flash defines from DTS
#define FLASH_DRIVER_NAME CONFIG_SOC_FLASH_NRF5_DEV_NAME
#define FLASH_ALIGN 4
-#define FLASH_AREA_IMAGE_0_OFFSET 0x08000
-#define FLASH_AREA_IMAGE_0_SIZE 0x34000
-#define FLASH_AREA_IMAGE_1_OFFSET 0x3C000
-#define FLASH_AREA_IMAGE_1_SIZE 0x34000
-#define FLASH_AREA_IMAGE_SCRATCH_OFFSET 0x70000
-#define FLASH_AREA_IMAGE_SCRATCH_SIZE 0x0D000
/* Flash sector size is provided by SoC family include */
