imx: add imx8x capricorn giedi board

Add support for i.MX8X based Capricorn Giedi SoM.

Supported interfaces: GPIO, ENET, eMMC, I2C, UART.

Console output:

  U-Boot SPL 2020.01-00003-gfd1c98f (Jan 07 2020 - 15:51:25 +0100)
  Trying to boot from MMC1
  Load image from MMC/SD 0x3e400

  U-Boot 2020.01-00003-gfd1c98f (Jan 07 2020 - 15:51:25 +0100) ##v01.07

  CPU:   NXP i.MX8QXP RevB A35 at 1200 MHz at 30C

  Model: Siemens Giedi
  Board: Capricorn
  Boot:  MMC0
  DRAM:  1022 MiB
  MMC:   FSL_SDHC: 0
  Loading Environment from MMC... OK
  In:    serial@5a080000
  Out:   serial@5a080000
  Err:   serial@5a080000
  Net:   eth1: ethernet@5b050000 [PRIME]
  Autobooting in 1 seconds, press "<Esc><Esc>" to stop

Signed-off-by: Anatolij Gustschin <agust@denx.de>
diff --git a/arch/arm/dts/imx8qxp-capricorn-u-boot.dtsi b/arch/arm/dts/imx8qxp-capricorn-u-boot.dtsi
new file mode 100644
index 0000000..1cf58fc
--- /dev/null
+++ b/arch/arm/dts/imx8qxp-capricorn-u-boot.dtsi
@@ -0,0 +1,133 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright 2019 Siemens AG
+ */
+
+&{/imx8qx-pm} {
+
+	u-boot,dm-spl;
+};
+
+&mu {
+	u-boot,dm-spl;
+};
+
+&clk {
+	u-boot,dm-spl;
+};
+
+&iomuxc {
+	u-boot,dm-spl;
+};
+
+&pd_lsio {
+	u-boot,dm-spl;
+};
+
+&pd_lsio_gpio0 {
+	u-boot,dm-spl;
+};
+
+&pd_lsio_gpio1 {
+	u-boot,dm-spl;
+};
+
+&pd_lsio_gpio2 {
+	u-boot,dm-spl;
+};
+
+&pd_lsio_gpio3 {
+	u-boot,dm-spl;
+};
+
+&pd_lsio_gpio4 {
+	u-boot,dm-spl;
+};
+
+&pd_lsio_gpio5 {
+	u-boot,dm-spl;
+};
+
+&pd_lsio_gpio6 {
+	u-boot,dm-spl;
+};
+
+&pd_lsio_gpio7 {
+	u-boot,dm-spl;
+};
+
+&pd_dma {
+	u-boot,dm-spl;
+};
+
+&pd_dma_lpuart0 {
+	u-boot,dm-spl;
+};
+
+&pd_dma_lpuart2 {
+	u-boot,dm-spl;
+};
+
+&pd_conn {
+	u-boot,dm-spl;
+};
+
+&pd_conn_sdch0 {
+	u-boot,dm-spl;
+};
+
+&pd_conn_sdch1 {
+	u-boot,dm-spl;
+};
+
+&pd_conn_sdch2 {
+	u-boot,dm-spl;
+};
+
+&gpio0 {
+	u-boot,dm-spl;
+};
+
+&gpio1 {
+	u-boot,dm-spl;
+};
+
+&gpio2 {
+	u-boot,dm-spl;
+};
+
+&gpio3 {
+	u-boot,dm-spl;
+};
+
+&gpio4 {
+	u-boot,dm-spl;
+};
+
+&gpio5 {
+	u-boot,dm-spl;
+};
+
+&gpio6 {
+	u-boot,dm-spl;
+};
+
+&gpio7 {
+	u-boot,dm-spl;
+};
+
+&lpuart0 {
+	u-boot,dm-spl;
+};
+
+&lpuart2 {
+	u-boot,dm-spl;
+};
+
+&usdhc1 {
+	u-boot,dm-spl;
+};
+
+&usdhc2 {
+	u-boot,dm-spl;
+};