tools(unit-test-app): Modify for ESP8266

1. Remove unused or unsupported unit test
2. Add extra header file to pass compiling
3. Remove unsupported functions

components/esp8266/include/soc/cpu.h

@@ -0,0 +1,40 @@
+// Copyright 2010-2016 Espressif Systems (Shanghai) PTE LTD
+//
+// 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 _SOC_CPU_H
+#define _SOC_CPU_H
+
+#include <stdint.h>
+#include <stdbool.h>
+#include <stddef.h>
+#include "xtensa/corebits.h"
+#include "xtensa/config/core.h"
+
+/* C macros for xtensa special register read/write/exchange */
+
+#define RSR(reg, curval)  asm volatile ("rsr %0, " #reg : "=r" (curval));
+#define WSR(reg, newval)  asm volatile ("wsr %0, " #reg : : "r" (newval));
+#define XSR(reg, swapval) asm volatile ("xsr %0, " #reg : "+r" (swapval));
+
+/** @brief Read current stack pointer address
+ *
+ */
+static inline void *get_sp()
+{
+    void *sp;
+    asm volatile ("mov %0, sp;" : "=r" (sp));
+    return sp;
+}
+
+#endif