Call HAL free functions from C++ destructors

Add missing calls to HAL free to the following drivers
- AnalogIn
- QSPI
- SerialBase

Author: Kyle Kearney

drivers/AnalogIn.h

@@ -151,7 +151,9 @@ class AnalogIn {
 
     virtual ~AnalogIn()
     {
-        // Do nothing
+        lock();
+        analogin_free(&_adc);
+        unlock();
     }
 
 protected:

drivers/QSPI.h

@@ -117,6 +117,9 @@ class QSPI : private NonCopyable<QSPI> {
 
     virtual ~QSPI()
     {
+        lock();
+        qspi_free(&_qspi);
+        unlock();
     }
 
     /** Configure the data transmission format

drivers/source/SerialBase.cpp

@@ -287,6 +287,10 @@ SerialBase::~SerialBase()
     for (int irq = 0; irq < IrqCnt; irq++) {
         attach(nullptr, (IrqType)irq);
     }
+
+    if (_rx_enabled || _tx_enabled) {
+        serial_free(&_serial);
+    }
 }
 
 #if DEVICE_SERIAL_FC