configure chip sleep
| SW_CPU_INT | rtc software interrupt to main cpu |
| SLP_REJECT_CAUSE_CLR | clear rtc sleep reject cause |
| APB2RTC_BRIDGE_SEL | 1: APB to RTC using bridge, 0: APB to RTC using sync |
| SDIO_ACTIVE_IND | SDIO active indication |
| SLP_WAKEUP | leep wakeup bit |
| SLP_REJECT | leep reject bit |
| SLEEP_EN | sleep enable bit |