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/doc/board/rockchip/rockchip.rst b/doc/board/rockchip/rockchip.rst
index 0290d81..b5563b8 100644
--- a/doc/board/rockchip/rockchip.rst
+++ b/doc/board/rockchip/rockchip.rst
@@ -92,6 +92,7 @@
 
 * rk3588
      - Edgeble Neural Compute Module 6 SoM - Neu6a (neu6a-io-rk3588)
+     - Radxa ROCK 5B (rock5b-rk3588)
 
 * rv1108
      - Rockchip Evb-rv1108 (evb-rv1108)