dts: arm: st: h7: add support for stm32h730XB

Extends H7 series with DeviceTree for
STM32H730XB SoC from H730 line.

Signed-off-by: Georgij Cernysiov <geo.cgv@gmail.com>
diff --git a/dts/arm/st/h7/stm32h730Xb.dtsi b/dts/arm/st/h7/stm32h730Xb.dtsi
new file mode 100644
index 0000000..48f67f1
--- /dev/null
+++ b/dts/arm/st/h7/stm32h730Xb.dtsi
@@ -0,0 +1,18 @@
+/*
+ * Copyright (c) 2022 Georgij Cernysiov <geo.cgv@gmail.com>
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <mem.h>
+#include <st/h7/stm32h730.dtsi>
+
+/ {
+	soc {
+		flash-controller@52002000 {
+			flash0: flash@8000000 {
+				reg = <0x08000000 DT_SIZE_K(128)>;
+			};
+		};
+	};
+};