feat(stm32mp2): disable PIE by default on STM32MP2 platform

Allow to disable ENABLE_PIE on STM32MP2. BL31 is loaded at the beginning
of SYSRAM whatever the options set. Set ENABLE_PIE to 0 by default.
This should allow us to reduce BL31 and BL2 size.

Change-Id: Ie8c83c9205e81301eb1fdcf24b94216172586630
Signed-off-by: Maxime Méré <maxime.mere@foss.st.com>
diff --git a/plat/st/stm32mp2/platform.mk b/plat/st/stm32mp2/platform.mk
index a9f8d8f..d5e2785 100644
--- a/plat/st/stm32mp2/platform.mk
+++ b/plat/st/stm32mp2/platform.mk
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2023-2024, STMicroelectronics - All Rights Reserved
+# Copyright (c) 2023-2025, STMicroelectronics - All Rights Reserved
 #
 # SPDX-License-Identifier: BSD-3-Clause
 #
@@ -11,9 +11,12 @@
 include plat/st/common/common.mk
 
 CRASH_REPORTING			:=	1
-ENABLE_PIE			:=	1
+# Disable PIE by default. To re-enable it, uncomment next line.
+#ENABLE_PIE			:=	1
 PROGRAMMABLE_RESET_ADDRESS	:=	1
+ifeq ($(ENABLE_PIE),1)
 BL2_IN_XIP_MEM			:=	1
+endif
 
 STM32MP_BL33_EL1		?=	1
 ifeq ($(STM32MP_BL33_EL1),1)