feat(stm32mp1-fdts): add DT files for STM32MP13

STM32MP13 is a single Cortex-A7 CPU, without co-processor.
As for STM32MP15x SoC family, STM32MP15x SoCs come with different
features, depending on SoC version. Each peripheral node is created.
Some are left empty for the moment , and will be filled later on.

Change-Id: I0166bb70dfa7f717e89e89883b059a5b873c4ef7
Signed-off-by: Yann Gautier <yann.gautier@st.com>
diff --git a/fdts/stm32mp135.dtsi b/fdts/stm32mp135.dtsi
new file mode 100644
index 0000000..415bb9b
--- /dev/null
+++ b/fdts/stm32mp135.dtsi
@@ -0,0 +1,12 @@
+// SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause)
+/*
+ * Copyright (C) STMicroelectronics 2022 - All Rights Reserved
+ * Author: Alexandre Torgue <alexandre.torgue@foss.st.com> for STMicroelectronics.
+ */
+
+#include "stm32mp133.dtsi"
+
+/ {
+	soc {
+	};
+};