gnss: add mbtk gnss AT command

Change-Id: I2db86f963e74726aea170a1b218bed7e1b013379
diff --git a/mbtk/mbtk_gnssd/gnss_info.h b/mbtk/mbtk_gnssd/gnss_info.h
index a6b64c9..78662a9 100755
--- a/mbtk/mbtk_gnssd/gnss_info.h
+++ b/mbtk/mbtk_gnssd/gnss_info.h
@@ -53,6 +53,17 @@
     GNSS_STATE_READY,       // GNSS is ready.
 } gnss_state_enum;
 
+typedef enum {
+    GNSS_RESULT_STATE_OPEN_SUCCESS,
+    GNSS_RESULT_STATE_OPEN_FAIL,
+    GNSS_RESULT_STATE_CLOSE_SUCCESS,
+    GNSS_RESULT_STATE_CLOSE_FAIL,
+    GNSS_RESULT_STATE_SET_SUCCESS,
+    GNSS_RESULT_STATE_SET_FAIL,
+    GNSS_RESULT_STATE_UNSUPPORT,
+    GNSS_RESULT_STATE_UNKNOWN_ERROR,
+} gnss_result_enum;
+
 typedef struct {
     gnss_id_enum gnss_id;
     char dev_name[32];