Fix Jira 670 A compile error occurs with two BLE methods with the same name

1. Add method uuid_cstr in BLEAttribute class.
2. Remove the duplicate file.

Author: sgbihu

libraries/CurieBLE/src/BLEAttribute.cpp

@@ -67,6 +67,11 @@ BLEAttribute::uuid() const {
     return _uuid_cstr;
 }
 
+const char*
+BLEAttribute::uuid_cstr() const {
+    return _uuid_cstr;
+}
+
 struct bt_uuid *BLEAttribute::uuid(void)
 {
     return (struct bt_uuid *)&_uuid;

libraries/CurieBLE/src/BLEAttribute.h

@@ -43,6 +43,13 @@ class BLEAttribute {
      */
     const char* uuid(void) const;
 
+    /**
+     * Get the string representation of the Attribute
+     *
+     * @return const char* string representation of the Attribute
+     */
+    const char* uuid_cstr(void) const;
+    
     /**
      * @brief   Get the UUID raw data
      *