FmpDevicePkg/FmpDxe: Use new FmpDeviceLib APIs

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=1525

Update FmpDxe to support multiple controllers and use
new FmpDeviceLib APIs to support Stop/Unload and to
set the context for the worker functions in the
FmpDeviceLib.

Cc: Sean Brogan <sean.brogan@microsoft.com>
Cc: Bret Barkelew <Bret.Barkelew@microsoft.com>
Cc: Liming Gao <liming.gao@intel.com>
Signed-off-by: Michael D Kinney <michael.d.kinney@intel.com>
Reviewed-by: Eric Jin <eric.jin@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>

FmpDevicePkg/FmpDxe/FmpDxeLib.inf

@@ -4,7 +4,7 @@
 #  information provided through PCDs and libraries.
 #
 #  Copyright (c) 2016, Microsoft Corporation. All rights reserved.<BR>
-#  Copyright (c) 2018, Intel Corporation. All rights reserved.<BR>
+#  Copyright (c) 2018 - 2019, Intel Corporation. All rights reserved.<BR>
 #
 #  SPDX-License-Identifier: BSD-2-Clause-Patent
 ##
@@ -18,6 +18,7 @@
   VERSION_STRING                 = 1.0
   LIBRARY_CLASS                  = NULL
   CONSTRUCTOR                    = FmpDxeEntryPoint
+  DESTRUCTOR                     = FmpDxeLibDestructor
 
 #
 # The following information is for reference only and not required by the build tools.
@@ -27,6 +28,7 @@
 
 [Sources]
   FmpDxe.c
+  FmpDxe.h
   DetectTestKey.c
   VariableSupport.h
   VariableSupport.c