board: rockchip: add Radxa ROCK5B Rk3588 board

ROCK 5B is a Rockchip RK3588 based SBC (Single Board Computer) by Radxa.

There are tree variants depending on the DRAM size : 4G, 8G and 16G.

Specification:

    Rockchip Rk3588 SoC
    4x ARM Cortex-A76, 4x ARM Cortex-A55
    4/8/16GB memory LPDDR4x
    Mali G610MC4 GPU
    MIPI CSI 2 multiple lanes connector
    eMMC module connector
    uSD slot (up to 128GB)
    2x USB 2.0, 2x USB 3.0
    2x HDMI output, 1x HDMI input
    Ethernet port
    40-pin IO header including UART, SPI, I2C and 5V DC power in
    USB PD over USB Type-C
    Size: 85mm x 54mm

Kernel commits:
a1d3281450ab ("arm64: dts: rockchip: Add rock-5b board")
6fb13f888f2a ("arm64: dts: rockchip: Update sdhci alias for rock-5b")

Signed-off-by: Eugen Hristev <eugen.hristev@collabora.com>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
diff --git a/arch/arm/dts/Makefile b/arch/arm/dts/Makefile
index 959d7e2..c160e884 100644
--- a/arch/arm/dts/Makefile
+++ b/arch/arm/dts/Makefile
@@ -170,7 +170,8 @@
 	rk3568-rock-3a.dtb
 
 dtb-$(CONFIG_ROCKCHIP_RK3588) += \
-	rk3588-edgeble-neu6a-io.dtb
+	rk3588-edgeble-neu6a-io.dtb \
+	rk3588-rock-5b.dtb
 
 dtb-$(CONFIG_ROCKCHIP_RV1108) += \
 	rv1108-elgin-r1.dtb \