ArmPkg: implement ResetSystemLib using PSCI 0.2 calls

This adds an implementation of the ResetSystemLib library class as
defined in MdeModulePkg. It is used as the platform glue by the generic
ResetSystemRuntimeDxe which lives in the same package.

This implementation is intended to replace the EfiResetSystemLib based
implementation that is deprecated now that we have decided that there is
no longer a reason to keep a different ResetSystem() implementation
under EmbeddedPkg.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Leif Lindholm <leif.lindholm@linaro.org>

ArmPkg/Library/ArmSmcPsciResetSystemLib/ArmSmcPsciResetSystemLib.inf

@@ -0,0 +1,35 @@
+#/** @file
+#  ResetSystemLib implementation using PSCI calls
+#
+#  Copyright (c) 2017, Linaro Ltd. All rights reserved.<BR>
+#
+#  This program and the accompanying materials
+#  are licensed and made available under the terms and conditions of the BSD License
+#  which accompanies this distribution. The full text of the license may be found at
+#  http://opensource.org/licenses/bsd-license.php
+#
+#  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+#  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+#
+#**/
+
+[Defines]
+  INF_VERSION                    = 0x00010019
+  BASE_NAME                      = ArmSmcPsciResetSystemLib
+  FILE_GUID                      = 18B12C83-7718-4D83-ADA4-87F2FE698DD4
+  MODULE_TYPE                    = BASE
+  VERSION_STRING                 = 1.0
+  LIBRARY_CLASS                  = ResetSystemLib
+
+[Sources]
+  ArmSmcPsciResetSystemLib.c
+
+[Packages]
+  ArmPkg/ArmPkg.dec
+  MdeModulePkg/MdeModulePkg.dec
+  MdePkg/MdePkg.dec
+
+[LibraryClasses]
+  ArmSmcLib
+  BaseLib
+  DebugLib