Implement interrupts and noInterrupts

- Using irq_lock and irq_unlock zephyr apis.

Signed-off-by: Ayush Singh <ayush@beagleboard.org>

Author: Ayush1325

cores/arduino/zephyrCommon.cpp

@@ -464,3 +464,18 @@ void disableInterrupt(pin_size_t pinNumber) {
     pcb->handlers[BIT(arduino_pins[pinNumber].pin)].enabled = false;
   }
 }
+
+static unsigned int irq_key = UINT_MAX;
+
+void interrupts(void) {
+  if (irq_key != UINT_MAX) {
+    irq_unlock(irq_key);
+    irq_key = UINT_MAX;
+  }
+}
+
+void noInterrupts(void) {
+  if (irq_key == UINT_MAX) {
+    irq_key = irq_lock();
+  }
+}