ARM: dts: stm32: DT alignment with kernel v5.3

Device tree and binding alignment with kernel v5.3
and converted to SPDX.

Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
Reviewed-by: Patrice Chotard <patrice.chotard@st.com>
diff --git a/include/dt-bindings/mfd/st,stpmic1.h b/include/dt-bindings/mfd/st,stpmic1.h
index b2d6c83..321cd08 100644
--- a/include/dt-bindings/mfd/st,stpmic1.h
+++ b/include/dt-bindings/mfd/st,stpmic1.h
@@ -43,4 +43,8 @@
 #define IT_SWIN_F	30
 #define IT_SWIN_R	31
 
+/* BUCK MODES definitions */
+#define STPMIC1_BUCK_MODE_NORMAL 0
+#define STPMIC1_BUCK_MODE_LP 2
+
 #endif /* __DT_BINDINGS_STPMIC1_H__ */