sdk: add missing version.h file

Author: igrr

tools/sdk/include/version.h

@@ -0,0 +1,11 @@
+#ifndef ESP_SDK_VERSION_H
+#define ESP_SDK_VERSION_H
+
+#define ESP_SDK_VERSION_MAJOR   2
+#define ESP_SDK_VERSION_MINOR   2
+#define ESP_SDK_VERSION_PATCH   0
+
+#define ESP_SDK_VERSION_NUMBER 0x020200
+#define ESP_SDK_VERSION_STRING  "2.2.0"
+
+#endif