rockchip: rk3576: Add support for ROC-RK3576-PC board

The ROC-RK3576-PC is a SBC made by Firefly, designed around the RK3576
SoC. This adds the needed board infrastructure and config for it.

Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Reviewed-by: Jonas Karlman <jonas@kwiboo.se>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
diff --git a/arch/arm/dts/rk3576-roc-pc-u-boot.dtsi b/arch/arm/dts/rk3576-roc-pc-u-boot.dtsi
new file mode 100644
index 0000000..9724034
--- /dev/null
+++ b/arch/arm/dts/rk3576-roc-pc-u-boot.dtsi
@@ -0,0 +1,11 @@
+// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+/*
+ * Copyright (c) 2023 Joshua Riek <jjriek@verizon.net>
+ *
+ */
+
+#include "rk3576-u-boot.dtsi"
+
+&sdhci {
+	cap-mmc-highspeed;
+};
diff --git a/arch/arm/mach-rockchip/rk3576/Kconfig b/arch/arm/mach-rockchip/rk3576/Kconfig
index a94dc67..f347caf 100644
--- a/arch/arm/mach-rockchip/rk3576/Kconfig
+++ b/arch/arm/mach-rockchip/rk3576/Kconfig
@@ -1,5 +1,11 @@
 if ROCKCHIP_RK3576
 
+config TARGET_ROC_PC_RK3576
+	bool "Firefly ROC-RK3576-PC"
+	help
+	  ROC-RK3576-PC is a single board computer from Firefly
+	  using the Rockchip RK3576.
+
 config ROCKCHIP_BOOT_MODE_REG
 	default 0x26024040
 
@@ -9,6 +15,8 @@
 config SYS_SOC
 	default "rk3576"
 
+source board/firefly/roc-pc-rk3576/Kconfig
+
 config SYS_CONFIG_NAME
 	default "rk3576_common"