mbed namespace removed add mbed indicator to QSPI

Author: Offir Kochalsky

components/storage/blockdevice/COMPONENT_QSPIF/QSPIFBlockDevice.h

@@ -296,7 +296,7 @@ class QSPIFBlockDevice : public BlockDevice {
     // Internal Members
 
     // QSPI Driver Object
-    QSPI _qspi;
+    mbed::QSPI _qspi;
 
     // Static List of different QSPI based Flash devices csel that already exist
     // Each QSPI Flash device csel can have only 1 QSPIFBlockDevice instance