register description
| WDT_CHIP_RESET_WIDTH | chip reset siginal pulse width |
| WDT_CHIP_RESET_EN | wdt reset whole chip enable |
| WDT_PAUSE_IN_SLP | pause WDT in sleep |
| WDT_PROCPU_RESET_EN | enable WDT reset PRO CPU |
| WDT_FLASHBOOT_MOD_EN | enable WDT in flash boot |
| WDT_SYS_RESET_LENGTH | system reset counter length |
| WDT_CPU_RESET_LENGTH | CPU reset counter length |
| WDT_STG3 | 1: interrupt stage en |
| WDT_STG2 | 1: interrupt stage en |
| WDT_STG1 | 1: interrupt stage en |
| WDT_STG0 | 1: interrupt stage en |
| WDT_EN | Need add desc |