bosch: Add initial board support for ACC

The Bosch ACC (Air Center Control) Board is based on the i.MX6D.

The device tree is copied from Linux, see [1]. The only difference
compared to the Linux DT is the removal of usbphynop properties. They are
defined in the Linux version of imx6qdl.dtsi, but not in the u-boot
version.

[1] Commit 6192cf8ac082 from
    git.kernel.org/pub/scm/linux/kernel/git/shawnguo/linux.git

Signed-off-by: Philip Oberfichtner <pro@denx.de>
diff --git a/arch/arm/dts/imx6q-bosch-acc-u-boot.dtsi b/arch/arm/dts/imx6q-bosch-acc-u-boot.dtsi
new file mode 100644
index 0000000..37c182d
--- /dev/null
+++ b/arch/arm/dts/imx6q-bosch-acc-u-boot.dtsi
@@ -0,0 +1,80 @@
+// SPDX-License-Identifier: GPL-2.0+
+
+/* Copyright (C) 2022 Denx Software Engineering GmbH
+ * Philip Oberfichtner <pro@denx.de>
+ */
+
+/ {
+	chosen {
+		stdout-path = &uart2;
+	};
+
+	soc {
+		u-boot,dm-spl;
+
+		bus@2000000 {
+			u-boot,dm-spl;
+
+			spba-bus@2000000 {
+				u-boot,dm-spl;
+			};
+		};
+
+		bus@2100000 {
+			u-boot,dm-spl;
+		};
+	};
+
+	bootcount {
+		compatible = "u-boot,bootcount-pmic";
+		pmic = <&pmic>;
+	};
+};
+
+&uart1 {
+	u-boot,dm-spl;
+};
+
+&uart2 {
+	u-boot,dm-spl;
+};
+
+&usdhc2 {
+	u-boot,dm-spl;
+};
+
+&usdhc4 {
+	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;
+};
+
+&wdog1 {
+	u-boot,dm-spl;
+};