plat/arm/css/sgi: Map flash used for mem_protect

The SGI platform defines the macro PLAT_ARM_MEM_PROT_ADDR which
indicates that the platform has mitigation for cold reboot attacks.

However, the flash memory used for the mem_protect region was not
mapped. This results in a crash when an OS calls PSCI MEM_PROTECT.

To fix this map the flash region used for mem_protect.

Change-Id: Ia494f924ecfe2ce835c045689ba8f942bf0941f4
Signed-off-by: Sami Mujawar <sami.mujawar@arm.com>
diff --git a/plat/arm/css/sgi/include/sgi_base_platform_def.h b/plat/arm/css/sgi/include/sgi_base_platform_def.h
index 14cdb7e..159084f 100644
--- a/plat/arm/css/sgi/include/sgi_base_platform_def.h
+++ b/plat/arm/css/sgi/include/sgi_base_platform_def.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2018-2020, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2018-2020, Arm Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -39,7 +39,7 @@
 #  define PLAT_SP_IMAGE_MAX_XLAT_TABLES	10
 # else
 #  define PLAT_ARM_MMAP_ENTRIES		(5 + ((CSS_SGI_CHIP_COUNT - 1) * 3))
-#  define MAX_XLAT_TABLES		(5 + ((CSS_SGI_CHIP_COUNT - 1) * 3))
+#  define MAX_XLAT_TABLES		(6 + ((CSS_SGI_CHIP_COUNT - 1) * 3))
 # endif
 #elif defined(IMAGE_BL32)
 # define PLAT_ARM_MMAP_ENTRIES		8