soc: arm: atmel_sam: sam4s: add support for sam4sa16c

Add soc support for sam4sa16c variant

Signed-off-by: Pieter De Gendt <pieter.degendt@basalte.be>
diff --git a/dts/arm/atmel/sam4sa16c.dtsi b/dts/arm/atmel/sam4sa16c.dtsi
new file mode 100644
index 0000000..ae96e4b
--- /dev/null
+++ b/dts/arm/atmel/sam4sa16c.dtsi
@@ -0,0 +1,22 @@
+/*
+ * Copyright (c) 2022 Basalte bv
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <mem.h>
+#include <atmel/sam4s.dtsi>
+
+/ {
+	soc {
+		flash-controller@400e0a00 {
+			flash0: flash@400000 {
+				reg = <0x00400000 DT_SIZE_K(1024)>;
+			};
+		};
+
+		sram0: memory@20100000 {
+			reg = <0x20100000 DT_SIZE_K(160)>;
+		};
+	};
+};