chore(core1-control): Split out core1_is_ready()

This function is useful on its own for more complex lifecycle management
in Epicardium.  Split it out of core1_wait_ready() so it can be used.

epicardium/api/control.c

@@ -214,10 +214,10 @@ void core1_trigger_reset(void)
 	interrupt_trigger_sync(EPIC_INT_RESET);
 }
 
-void core1_wait_ready(void)
+bool core1_is_ready(void)
 {
-	/* Wait for the core to accept */
-	while (1) {
+	bool ready;
+
 	while (SEMA_GetSema(_CONTROL_SEMAPHORE) == E_BUSY) {
 	}
 
@@ -225,12 +225,20 @@ void core1_wait_ready(void)
 	 * core 1 will set the ready flag once it is spinning in the
 	 * above loop, waiting for a new IVT.
 	 */
-		if (core1_info.ready) {
+	ready = core1_info.ready;
+
 	SEMA_FreeSema(_CONTROL_SEMAPHORE);
-			break;
+
+	return ready;
 }
 
-		SEMA_FreeSema(_CONTROL_SEMAPHORE);
+void core1_wait_ready(void)
+{
+	/* Wait for the core to accept */
+	while (1) {
+		if (core1_is_ready()) {
+			break;
+		}
 
 		for (int i = 0; i < 10000; i++) {
 		}

epicardium/api/dispatcher.h

@@ -39,6 +39,9 @@ void core1_boot(void);
 /* Reset core 1 into a state where it can accept a new payload */
 void core1_trigger_reset(void);
 
+/* Check if core 1 is ready for a new payload */
+bool core1_is_ready(void);
+
 /* Wait for core 1 to respond that it is ready for a new payload */
 void core1_wait_ready(void);