Fix declaration of enum (#2554)

***NO_CI***

Author: josesimoes

targets/ESP32/_nanoCLR/nanoFramework.Hardware.ESP32/nanoFramework_hardware_esp32_native.h

@@ -12,6 +12,12 @@
 #include <nanoCLR_Checks.h>
 #include <corlib_native.h>
 
+
+typedef enum __nfpack HighResTimerEventType
+{
+    HighResTimerEventType_TimerExpired = 101,
+} HighResTimerEventType;
+
 typedef enum __nfpack NativeMemory_MemoryType
 {
     NativeMemory_MemoryType_All = 0,

targets/ESP32/_nanoCLR/nanoFramework.Hardware.ESP32/nanoFramework_hardware_esp32_native_Hardware_Esp32_HighResTimer.cpp

@@ -10,15 +10,6 @@
 
 esp_timer_handle_t hrtimers[MAX_HRTIMERS] = {};
 
-//////////////////////////////////////////////////////////////////////////////////////////////////////////////
-// !!! KEEP IN SYNC WITH nanoFramework.Hardware.Esp32.HighResTimerEventType (in managed code) !!! //
-//////////////////////////////////////////////////////////////////////////////////////////////////////////////
-
-enum HighResTimerEventType
-{
-    TimerExpired = 101
-};
-
 static int FindNextTimerIndex()
 {
     for (int index = 0; index < MAX_HRTIMERS; index++)
@@ -33,7 +24,7 @@ static int FindNextTimerIndex()
 static void HRtimer_callback(void *arg)
 {
     esp_timer_handle_t timer_handle = hrtimers[(int)arg];
-    PostManagedEvent(EVENT_HIGH_RESOLUTION_TIMER, HighResTimerEventType::TimerExpired, 0, (uint32_t)timer_handle);
+    PostManagedEvent(EVENT_HIGH_RESOLUTION_TIMER, HighResTimerEventType_TimerExpired, 0, (uint32_t)timer_handle);
 }
 
 HRESULT Library_nanoFramework_hardware_esp32_native_nanoFramework_Hardware_Esp32_HighResTimer::