ARM: dts: rmobile: Factor out U-Boot extras

Pull out u-boot extras into dtsi files to make synchronization of DTS
from Linux kernel as easy as a simple copy. All the U-Boot extras are
now in *-u-boot.dts* files instead.

Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>
Cc: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
diff --git a/arch/arm/dts/r8a779x-u-boot.dtsi b/arch/arm/dts/r8a779x-u-boot.dtsi
new file mode 100644
index 0000000..0baac1d
--- /dev/null
+++ b/arch/arm/dts/r8a779x-u-boot.dtsi
@@ -0,0 +1,25 @@
+/*
+ * Device Tree Source extras for U-Boot on RCar Gen3
+ *
+ * Copyright (C) 2018 Marek Vasut <marek.vasut@gmail.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0
+ */
+
+/ {
+	soc {
+		u-boot,dm-pre-reloc;
+	};
+};
+
+&cpg {
+	u-boot,dm-pre-reloc;
+};
+
+&extal_clk {
+	u-boot,dm-pre-reloc;
+};
+
+&prr {
+	u-boot,dm-pre-reloc;
+};