board: rockchip: add support for Qnap TS433 devices

The Qnap TS433 is a 4-bay NAS based around the RK3568.

Two SATA bays are connected to the RK3568's own SATA controllers while
the other two are connected to a JMicron SATA controller living on the
PCIe bus.

It provides one 2.5Gb and one 1Gb ethernet port as well as 3 usb ports.

Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
diff --git a/board/qnap/ts433/Kconfig b/board/qnap/ts433/Kconfig
new file mode 100644
index 0000000..b00e1f9
--- /dev/null
+++ b/board/qnap/ts433/Kconfig
@@ -0,0 +1,12 @@
+if TARGET_QNAP_TS433_RK3568
+
+config SYS_BOARD
+	default "qnap_ts433"
+
+config SYS_VENDOR
+	default "qnap"
+
+config SYS_CONFIG_NAME
+	default "qnap_ts433"
+
+endif
diff --git a/board/qnap/ts433/MAINTAINERS b/board/qnap/ts433/MAINTAINERS
new file mode 100644
index 0000000..c2b31ad
--- /dev/null
+++ b/board/qnap/ts433/MAINTAINERS
@@ -0,0 +1,8 @@
+QNAP-TS433
+M:	Heiko Stuebner <heiko@sntech.de>
+S:	Maintained
+F:	board/qnap/ts433/
+F:	doc/board/qnap/
+F:	include/configs/qnap_ts433.h
+F:	configs/qnap-ts433-rk3568_defconfig
+F:	arch/arm/dts/rk3568-qnap-ts433-u-boot.dtsi