board: rockchip: Add Sonoff iHost board

Sonoff iHost is gateway device designed to provide a Smart Home Hub,
it is based on Rockchip RV1126. There is also a version with 2GB RAM
based off the RV1109 dual core SoC however this works with the same
config as the RV1126 for uboot purposes.

Features:
- Rockchip RV1126
- 4GB DDR4
- 8GB eMMC
- microSD slot
- RMII Ethernet PHY
- 1x USB 2.0 Host
- 1x USB 2.0 OTG
- Realtek RTL8723DS WiFi/BT
- EFR32MG21 Silabs Zigbee radio
- Speaker/Microphone

Signed-off-by: Tim Lunn <tim@feathertop.org>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>

arch/arm/dts/rv1126-sonoff-ihost-u-boot.dtsi

@@ -0,0 +1,13 @@
+// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+
+#include "rv1126-u-boot.dtsi"
+
+/ {
+	chosen {
+		u-boot,spl-boot-order = "same-as-spl", &sdmmc, &emmc;
+	};
+};
+
+&sdio {
+	status = "disabled";
+};

arch/arm/mach-rockchip/rv1126/Kconfig

@@ -14,6 +14,13 @@ config TARGET_RV1126_NEU2
 	  IO board and Neu2 needs to mount on top of this IO board in order to
 	  create complete Edgeble Neural Compute Module 2(Neu2) IO platform.
 
+config TARGET_RV1126_SONOFF_IHOST
+	bool "Sonoff iHost smart home hub"
+	help
+	  Sonoff iHost is a smart home gateway based on Rockchip RV1126 SoC.
+	  It features Wifi, Bluetooth and Zigbee radios that are used by many
+	  smart home devices.
+
 config SOC_SPECIFIC_OPTIONS # dummy
 	def_bool y
 	select HAS_CUSTOM_SYS_INIT_SP_ADDR
@@ -58,5 +65,6 @@ config TEXT_BASE
 	default 0x600000
 
 source board/edgeble/neural-compute-module-2/Kconfig
+source board/itead/sonoff-ihost/Kconfig
 
 endif