when ext_pwr comes back online the oled is not re-initialized and stays blank. this is particularly noticeable when coming out of sleep

the below was provided by @Nicell as a hack to work around the problem and suggested the ext_power should be moved to kernel level

#define DISPLAY_INIT_PRIORITY 95

DEVICE_AND_API_INIT(ssd1306, DT_INST_LABEL(0), ssd1306_init,
            &ssd1306_driver, NULL,
            POST_KERNEL, DISPLAY_INIT_PRIORITY,
            &ssd1306_driver_api);