ld_pwr_exc_protector: clear irq bit at pwr up

src/laser_diode/ld_pwr_exc_protector.rs

@@ -212,6 +212,7 @@ impl LdPwrExcProtector {
     pub fn pwr_on_and_arm_protection() {
         if let Some(ref mut wdg) = LdPwrExcProtector::get() {
             wdg.alarm_status = Status::default();
+            LdPwrExcProtector::clear_interrupt_bit();
             LdPwrExcProtector::pwr_on();
             // Interrupt should be enabled after power on to tackle the following edge case:
             //      Pd_Mon pin voltage has already exceed threshold before LD Power is on.