FVP: Remove re-definition of topology related build options

This patch removes re-definition of the following FVP build
options from plat\arm\board\fvp\fvp_def.h:
 'FVP_CLUSTER_COUNT'
 'FVP_MAX_CPUS_PER_CLUSTER'
 'FVP_MAX_PE_PER_CPU'
which are set in platform.mk.

This fixes a potential problem when a build option set in
platform.mk file can be re-defined in fvp_def.h header file
used by other build component with a different makefile which
does not set this option.
Ref. GENFW-3505.

Change-Id: I4288629920516acf2c239c7b733f92a0c5a812ff
Signed-off-by: Alexei Fedorov <Alexei.Fedorov@arm.com>

plat/arm/board/fvp/fvp_def.h

 /*
- * Copyright (c) 2014-2018, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2014-2020, ARM Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -10,15 +10,15 @@
 #include <lib/utils_def.h>
 
 #ifndef FVP_CLUSTER_COUNT
-#define FVP_CLUSTER_COUNT		2
+#error "FVP_CLUSTER_COUNT is not set in makefile"
 #endif
 
 #ifndef FVP_MAX_CPUS_PER_CLUSTER
-#define FVP_MAX_CPUS_PER_CLUSTER	4
+#error "FVP_MAX_CPUS_PER_CLUSTER is not set in makefile"
 #endif
 
 #ifndef FVP_MAX_PE_PER_CPU
-# define FVP_MAX_PE_PER_CPU		1
+#error "FVP_MAX_PE_PER_CPU is not set in makefile"
 #endif
 
 #define FVP_PRIMARY_CPU			0x0