rockchip: px30: add -u-boot dtsi for soc

Add soc level -u-boot.dtst so that boards can share the common nodes.

Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
diff --git a/arch/arm/dts/px30-evb-u-boot.dtsi b/arch/arm/dts/px30-evb-u-boot.dtsi
index a2a2c07..aea9f4d 100644
--- a/arch/arm/dts/px30-evb-u-boot.dtsi
+++ b/arch/arm/dts/px30-evb-u-boot.dtsi
@@ -1,84 +1,6 @@
 // SPDX-License-Identifier: (GPL-2.0+ OR MIT)
 /*
- * (C) Copyright 2017 Rockchip Electronics Co., Ltd
+ * (C) Copyright 2020 Rockchip Electronics Co., Ltd
  */
 
-/ {
-	aliases {
-		mmc0 = &emmc;
-		mmc1 = &sdmmc;
-	};
-
-	chosen {
-		u-boot,spl-boot-order = &emmc, &sdmmc;
-	};
-};
-
-&dmc {
-	u-boot,dm-pre-reloc;
-};
-
-&uart2 {
-	clock-frequency = <24000000>;
-	u-boot,dm-pre-reloc;
-};
-
-&uart5 {
-	clock-frequency = <24000000>;
-	u-boot,dm-pre-reloc;
-};
-
-&sdmmc {
-	u-boot,dm-pre-reloc;
-
-	/* mmc to sram can't do dma, prevent aborts transfering TF-A parts */
-	u-boot,spl-fifo-mode;
-};
-
-&emmc {
-	u-boot,dm-pre-reloc;
-
-	/* mmc to sram can't do dma, prevent aborts transfering TF-A parts */
-	u-boot,spl-fifo-mode;
-};
-
-&grf {
-	u-boot,dm-pre-reloc;
-};
-
-&pmugrf {
-	u-boot,dm-pre-reloc;
-};
-
-&xin24m {
-	u-boot,dm-pre-reloc;
-};
-
-&cru {
-	u-boot,dm-pre-reloc;
-};
-
-&pmucru {
-	u-boot,dm-pre-reloc;
-};
-
-&saradc {
-	u-boot,dm-pre-reloc;
-	status = "okay";
-};
-
-&gpio0 {
-	u-boot,dm-pre-reloc;
-};
-
-&gpio1 {
-	u-boot,dm-pre-reloc;
-};
-
-&gpio2 {
-	u-boot,dm-pre-reloc;
-};
-
-&gpio3 {
-	u-boot,dm-pre-reloc;
-};
+#include "px30-u-boot.dtsi"