[hal] Update runtime enum to allow selecting roborio 2 (#3565)

In some cases, knowing roborio 2 might be useful. This also creates a higher level enum that might be usable later for the discussion on more complex runtime types.

hal/src/test/native/cpp/HALTests.cpp

@@ -7,6 +7,6 @@
 
 namespace hal {
 TEST(HALTests, RuntimeType) {
-  EXPECT_EQ(HAL_RuntimeType::HAL_Mock, HAL_GetRuntimeType());
+  EXPECT_EQ(HAL_RuntimeType::HAL_Runtime_Simulation, HAL_GetRuntimeType());
 }
 }  // namespace hal