VDD_SDIO power domain can now be configured for light sleep
by the application. It is now possible to keep the power domain
ON during light sleep, keeping the GPIOs connected to it powered.
The power domain will, by default be:
- Kept ON if CONFIG_ESP_SYSTEM_PD_FLASH is not set
- Turned OFF if not set
The application can still force it to be ON by calling
`esp_sleep_pd_config(ESP_PD_DOMAIN_VDDSDIO, ESP_PD_OPTION_ON);`