board: st: add generic board for STM32MP1 family

Add first support for STM32MP157C-ED1 board with "Basic" boot chain
1/ Boot Rom: load SPL with STM32 image header in SYSRAM
2/ SPL: power up and initialize the DDR and load U-Boot image
        from SDCARD in DDR
3/ U-Boot: search and load extlinux.conf in SDCARD
           (DISTRO activated)

Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
diff --git a/board/st/stm32mp1/Kconfig b/board/st/stm32mp1/Kconfig
new file mode 100644
index 0000000..5ab9415
--- /dev/null
+++ b/board/st/stm32mp1/Kconfig
@@ -0,0 +1,12 @@
+if TARGET_STM32MP1
+
+config SYS_BOARD
+	default "stm32mp1"
+
+config SYS_VENDOR
+	default "st"
+
+config SYS_CONFIG_NAME
+	default "stm32mp1"
+
+endif