rust/hpet: remove stale TODO comment

The irq binding is already implemented in the following line, so the TODO comment is obsolete.

Signed-off-by: Mohd Kashif Khan <kashif04x@gmail.com>
Reviewed-by: Zhao Liu <zhao1.liu@intel.com>
Link: https://lore.kernel.org/r/20260126210910.28889-1-kashif04x@gmail.com
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

rust/hw/timer/hpet/src/device.rs

@@ -725,7 +725,6 @@ impl HPETState {
             self.irqs[0].lower();
             self.irqs[RTC_ISA_IRQ].lower();
         } else if deactivating_bit(old_val, new_val, HPET_CFG_LEG_RT_SHIFT) {
-            // TODO: Add irq binding: qemu_irq_lower(s->irqs[0])
             self.irqs[0].lower();
             self.pit_enabled.set(true);
             self.irqs[RTC_ISA_IRQ].set(self.rtc_irq_level.get() != 0);