If VDDSDIO is controlled by RTC (which is the case when using 1.8V flash
and CONFIG_BOOTLOADER_VDDSDIO_BOOST is enabled), need to allow VDDSDIO
to be controlled by the state machine before going into deep sleep.
1. When dual core cpu run access DPORT register, must do protection.
2. If access DPORT register, must use DPORT_REG_READ/DPORT_REG_WRITE and DPORT_XXX register operation macro.
