fix(morello): move BL31 to run from DRAM space

The EL3 runtime firmware has been running from internal trusted
SRAM space on the Morello platform. Due to unavailability of tag
support for the internal trusted SRAM this becomes a problem if
we enable capability pointers in BL31.

To support capability pointers in BL31 it has to be run from the
main DDR memory space. This patch updates the Morello platform
configuration such that BL31 is loaded and run from DDR space.

Signed-off-by: Manoj Kumar <manoj.kumar3@arm.com>
Change-Id: I16d4d757fb6f58c364f5133236d50fc06845e0b4
diff --git a/plat/arm/board/morello/platform.mk b/plat/arm/board/morello/platform.mk
index 86047e3..156b7ea 100644
--- a/plat/arm/board/morello/platform.mk
+++ b/plat/arm/board/morello/platform.mk
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2020-2021, Arm Limited. All rights reserved.
+# Copyright (c) 2020-2022, Arm Limited. All rights reserved.
 #
 # SPDX-License-Identifier: BSD-3-Clause
 #
@@ -83,6 +83,8 @@
 
 override ARM_PLAT_MT			:=	1
 
+override ARM_BL31_IN_DRAM		:=	1
+
 # Errata workarounds:
 ERRATA_N1_1868343			:=	1