1. raise vddsdio for 1.8v flash
2. gpio matrix config for flash
3. fix esp_restart function
todo:
to decide whether to raise core voltage
to test deep-sleep current
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.