ntwdt_lomcmd
rv = ntwdt_lomcmd(LW8_MBOX_WDT_SET, (intptr_t)&set_wdt);
rv = ntwdt_lomcmd(LW8_MBOX_WDT_GET, (intptr_t)&get_wdt);
static int ntwdt_lomcmd(int cmd, intptr_t arg);
return (ntwdt_lomcmd(LW8_MBOX_WDT_GET, (intptr_t)&get_wdt));