feat(stm32mp2-fdts): introduce stm32mp25 pinctrl files

Three packages exist for stm32mp25 dies. As ball-out is different
between them, this patch covers those differences by introducing
dedicated pinctrl dtsi files. Each dtsi pinctrl package file
describes the package ball-out through gpio-ranges.

Available packages are:

STM32MP25xAI: 18*18/FCBGA 172 ios
STM32MP25xAK: 14*14/FCBGA 144 ios
STM32MP25xAL: 10*10/TFBGA 144 ios

It includes also the common file used for pin groups definition.

Signed-off-by: Alexandre Torgue <alexandre.torgue@foss.st.com>
Signed-off-by: Yann Gautier <yann.gautier@st.com>
Change-Id: I8500ccccb7a96748f36ffc80edc91da8595f4da8
diff --git a/fdts/stm32mp25-pinctrl.dtsi b/fdts/stm32mp25-pinctrl.dtsi
new file mode 100644
index 0000000..4147449
--- /dev/null
+++ b/fdts/stm32mp25-pinctrl.dtsi
@@ -0,0 +1,6 @@
+// SPDX-License-Identifier: (GPL-2.0-or-later OR BSD-3-Clause)
+/*
+ * Copyright (C) 2023, STMicroelectronics - All Rights Reserved
+ * Author: Alexandre Torgue <alexandre.torgue@foss.st.com> for STMicroelectronics.
+ */
+#include <dt-bindings/pinctrl/stm32-pinfunc.h>