board: rockchip: Add FriendlyElec NanoPi R6S

The NanoPi R6S is a SBC by FriendlyElec based on the Rockchip RK3588s.
It comes with 4GB or 8GB of RAM, a microSD card slot, 32GB eMMC storage,
one RTL8211F 1GbE and two RTL8125 2.5GbE Ethernet ports, one USB 2.0
Type-A and one USB 3.0 Type-A port, a HDMI port, a 12-pin GPIO FPC
connector, a fan connector, IR receiver as well as some buttons and LEDs.

Add initial support for this board using the upstream devicetree sources.

Kernel commit:
f1b11f43b3e9 ("arm64: dts: rockchip: Add support for NanoPi R6S")

Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
Signed-off-by: Sebastian Kropatsch <seb-dev@mail.de>
diff --git a/arch/arm/mach-rockchip/rk3588/Kconfig b/arch/arm/mach-rockchip/rk3588/Kconfig
index 26e45f4..e751d64 100644
--- a/arch/arm/mach-rockchip/rk3588/Kconfig
+++ b/arch/arm/mach-rockchip/rk3588/Kconfig
@@ -90,6 +90,18 @@
 	  Type-A port, a HDMI port, a 30-pin GPIO header as well as some
 	  buttons and LEDs.
 
+config TARGET_NANOPI_R6S_RK3588S
+	bool "FriendlyElec NanoPi R6S"
+	select BOARD_LATE_INIT
+	help
+	  The NanoPi R6S is a SBC by FriendlyElec based on the Rockchip
+	  RK3588s.
+	  It comes with 4GB or 8GB of RAM, a microSD card slot, 32GB eMMC
+	  storage, one RTL8211F 1GbE and two RTL8125 2.5GbE Ethernet ports,
+	  one USB 2.0 Type-A and one USB 3.0 Type-A port, a HDMI port, a
+	  12-pin GPIO FPC connector, a fan connector, IR receiver as well
+	  as some buttons and LEDs.
+
 config TARGET_NOVA_RK3588
 	bool "Indiedroid Nova RK3588"
 	select BOARD_LATE_INIT
@@ -301,6 +313,7 @@
 source "board/edgeble/neural-compute-module-6/Kconfig"
 source "board/friendlyelec/nanopc-t6-rk3588/Kconfig"
 source "board/friendlyelec/nanopi-r6c-rk3588s/Kconfig"
+source "board/friendlyelec/nanopi-r6s-rk3588s/Kconfig"
 source "board/indiedroid/nova/Kconfig"
 source "board/pine64/quartzpro64-rk3588/Kconfig"
 source "board/turing/turing-rk1-rk3588/Kconfig"