runtime/esp32c3: use TIMG0 alarm interrupt for sleepTicks instead of busy-waiting

Signed-off-by: deadprogram <ron@hybridgroup.com>

src/runtime/interrupt/interrupt_esp32c3.go

@@ -55,6 +55,9 @@ func (i Interrupt) Enable() error {
 //go:linkname callHandlers runtime/interrupt.callHandlers
 func callHandlers(num int)
 
+//go:linkname signalInterrupt runtime.signalInterrupt
+func signalInterrupt()
+
 const (
 	IRQNUM_1 = 1 + iota
 	IRQNUM_2
@@ -203,6 +206,9 @@ func handleInterrupt() {
 		// Call registered interrupt handler(s)
 		callHandler(int(interruptNumber))
 
+		// Signal to sleepTicks that an interrupt has occurred.
+		signalInterrupt()
+
 		// disable CPU interrupts
 		riscv.MSTATUS.ClearBits(riscv.MSTATUS_MIE)