rockchip: rk3588-coolpi: Add boards to documentation

Add the CoolPi 4 Model B and CoolPi CM5 EVB board to the documentation.

Fixes: 3e15dee38d45 ("board: rockchip: Add support for rk3588 based Cool Pi CM5 EVB")
Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
Reviewed-by: Dragan Simic <dsimic@manjaro.org>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
diff --git a/doc/board/rockchip/rockchip.rst b/doc/board/rockchip/rockchip.rst
index 5dd5ea7..9a726e9 100644
--- a/doc/board/rockchip/rockchip.rst
+++ b/doc/board/rockchip/rockchip.rst
@@ -131,6 +131,8 @@
      - Turing Machines RK1 (turing-rk1-rk3588)
      - Xunlong Orange Pi 5 (orangepi-5-rk3588s)
      - Xunlong Orange Pi 5 Plus (orangepi-5-plus-rk3588)
+     - Yanyi Tech CoolPi 4 Model B (coolpi-4b-rk3588s)
+     - Yanyi Tech CoolPi CM5 EVB (coolpi-cm5-evb-rk3588)
 
 * rv1108
      - Rockchip Evb-rv1108 (evb-rv1108)