Import Mbed OS hard-float snapshot

UNITTESTS/target_h/rtos/rtos.h

@@ -0,0 +1,26 @@
+/*
+ * Copyright (c) 2018, Arm Limited and affiliates.
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef RTOS_H
+#define RTOS_H
+
+typedef enum {
+    osTimerOnce             = 0,          ///< One-shot timer.
+    osTimerPeriodic         = 1           ///< Repeating timer.
+} os_timer_type;
+
+#endif /* RTOS_H */