[PATCH] doc: rockchip: Update documentation with Rock Pi 4

[Walter Lozano]

Update README.rockchip to reflect the support of Radxa Rock Pi 4

Signed-off-by: Walter Lozano <walter.lozano at collabora.com>
---
 doc/README.rockchip | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/doc/README.rockchip b/doc/README.rockchip
index 70c8798ed2..c6718e83c7 100644
--- a/doc/README.rockchip
+++ b/doc/README.rockchip
@@ -59,7 +59,7 @@ Three RK3328 boards are supported:
    - Firefly / Libre Computer Project ROC-RK3328-CC board -
      use roc-cc-rk3328_defconfig
 
-Size RK3399 boards are supported (aarch64):
+Seven RK3399 boards are supported (aarch64):
 
    - EBV RK3399 - use evb_rk3399 configuration
    - Firefly RK3399 - use the firefly_rk3399 configuration
@@ -67,6 +67,7 @@ Size RK3399 boards are supported (aarch64):
    - Ficus - use ficus-rk3399 configuration
    - Rock960 (Vamrs) - use rock960-rk3399 configuration
    - Bob - use chromebook_bob configuration
+   - Radxa Rock Pi 4 - use rock-pi-4-rk3399_defconfig
 
 Four RK3368 boards are supported:
 
-- 
2.20.1