ArmPlatformPkg: remove ArmPlatformSysConfigLib library class

The only remaining user of ArmPlatformSysConfigLib has absorbed this
definition into its own edk2-platforms package, so let's remove it from
the shared code.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Leif Lindholm <leif.lindholm@linaro.org>

ArmPlatformPkg/Include/Library/ArmPlatformSysConfigLib.h

@@ -1,63 +0,0 @@
-/** @file  ArmPlatformSysConfigLib.h
-
-  Copyright (c) 2011-2012, ARM 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.
-
-**/
-
-#ifndef __ARM_PLATFORM_SYS_CONFIG_H__
-#define __ARM_PLATFORM_SYS_CONFIG_H__
-
-#include <Base.h>
-
-/* This header file makes it easier to access the System Configuration Registers
- * in the ARM Versatile Express motherboard.
- */
-
-//
-// Typedef
-//
-typedef UINT32  SYS_CONFIG_FUNCTION;
-
-//
-// Functions
-//
-RETURN_STATUS
-ArmPlatformSysConfigInitialize (
-  VOID
-  );
-
-RETURN_STATUS
-ArmPlatformSysConfigGet (
-  IN  SYS_CONFIG_FUNCTION   Function,
-  OUT UINT32*               Value
-  );
-
-RETURN_STATUS
-ArmPlatformSysConfigGetValues (
-  IN  SYS_CONFIG_FUNCTION   Function,
-  IN  UINTN                 Size,
-  OUT UINT32*               Values
-  );
-
-RETURN_STATUS
-ArmPlatformSysConfigSet (
-  IN  SYS_CONFIG_FUNCTION   Function,
-  IN  UINT32                Value
-  );
-
-RETURN_STATUS
-ArmPlatformSysConfigSetDevice (
-  IN  SYS_CONFIG_FUNCTION   Function,
-  IN  UINT32                Device,
-  IN  UINT32                Value
-  );
-
-#endif /* __SYS_CFG_REGISTERS_H__ */