feat(st): introduce new platform STM32MP2

This new STMicroelectronics SoC is based on a dual Cortex-A35.
For the moment, only BL2 is compiled with the common parts for ST
platforms.

Change-Id: I1bc4e6835dba4230359ea9b26d736791e27258aa
Signed-off-by: Yann Gautier <yann.gautier@st.com>
diff --git a/plat/st/stm32mp2/bl2_plat_setup.c b/plat/st/stm32mp2/bl2_plat_setup.c
new file mode 100644
index 0000000..e497c96
--- /dev/null
+++ b/plat/st/stm32mp2/bl2_plat_setup.c
@@ -0,0 +1,23 @@
+/*
+ * Copyright (c) 2023, STMicroelectronics - All Rights Reserved
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <cdefs.h>
+#include <stdint.h>
+
+void bl2_el3_early_platform_setup(u_register_t arg0 __unused,
+				  u_register_t arg1 __unused,
+				  u_register_t arg2 __unused,
+				  u_register_t arg3 __unused)
+{
+}
+
+void bl2_platform_setup(void)
+{
+}
+
+void bl2_el3_plat_arch_setup(void)
+{
+}