rockchip: cosmetic: Sort RK3288 boards

Sort rk3288 boards in alphabetical order.

Signed-off-by: Jernej Skrabec <jernej.skrabec@siol.net>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
Reviewed-by: Eddie Cai <eddie.cai.linux@gmail.com>
Acked-by: Simon Glass <sjg@chromium.org>
diff --git a/doc/README.rockchip b/doc/README.rockchip
index cb81efd..97c62f1 100644
--- a/doc/README.rockchip
+++ b/doc/README.rockchip
@@ -42,9 +42,9 @@
    - Fennec RK3288 - use fennec-rk3288 configuration
    - Firefly RK3288 - use firefly-rk3288 configuration
    - Hisense Chromebook - use chromebook_jerry configuration
-   - Tinker RK3288 - use tinker-rk3288 configuration
    - PopMetal RK3288 - use popmetal-rk3288 configuration
    - Radxa Rock 2 - use rock2 configuration
+   - Tinker RK3288 - use tinker-rk3288 configuration
 
 Two RK3036 board are supported: