Refactor memory manager so as to support device reset

Move out neoDevice dependent pieces of memory manager code into
separate methods. Those methods could be used for recreating a neoDevice
after a device reset is performed.

Related-To: LOCI-2615

Signed-off-by: Jitendra Sharma <jitendra.sharma@intel.com>

shared/source/device/device.cpp

@@ -47,12 +47,14 @@ Device::~Device() {
     for (auto &engine : engines) {
         engine.commandStreamReceiver->flushBatchedSubmissions();
     }
+    engines.clear();
 
     for (auto subdevice : subdevices) {
         if (subdevice) {
             delete subdevice;
         }
     }
+    subdevices.clear();
 
     syncBufferHandler.reset();
     commandStreamReceivers.clear();