arm: stm32: add new architecture for STM32MP family

- add new arch stm32mp for STM32 MPU/Soc based on Cortex A
- support for stm32mp157 SOC
- SPL is used as first boot stage loader
- using driver model for all the drivers, even in SPL
- all security feature are deactivated (ETZC and TZC)
- reused STM32 MCU drivers when it is possible

Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
diff --git a/arch/arm/mach-stm32mp/Makefile b/arch/arm/mach-stm32mp/Makefile
new file mode 100644
index 0000000..4620869
--- /dev/null
+++ b/arch/arm/mach-stm32mp/Makefile
@@ -0,0 +1,10 @@
+#
+# Copyright (C) 2018, STMicroelectronics - All Rights Reserved
+#
+# SPDX-License-Identifier:	GPL-2.0+	BSD-3-Clause
+#
+
+obj-y += cpu.o
+obj-y += dram_init.o
+
+obj-$(CONFIG_SPL_BUILD) += spl.o