rtc configure register
| GPIO_PIN0_HOLD | the hold configure of rtc gpio0 |
| GPIO_PIN1_HOLD | the hold configure of rtc gpio1 |
| GPIO_PIN2_HOLD | the hold configure of rtc gpio2 |
| GPIO_PIN3_HOLD | the hold configure of rtc gpio3 |
| GPIO_PIN4_HOLD | the hold configure of rtc gpio4 |
| GPIO_PIN5_HOLD | the hold configure of rtc gpio5 |