arm: dts: rockchip: Add dts for rk3308 evb

Add dts for rk3308 evb, sync from the linux kernel
upstream list [0].

[0]https://patchwork.kernel.org/patch/11201555/

Signed-off-by: Andy Yan <andy.yan@rock-chips.com>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
diff --git a/arch/arm/dts/Makefile b/arch/arm/dts/Makefile
index 45538d4..769d0eb 100644
--- a/arch/arm/dts/Makefile
+++ b/arch/arm/dts/Makefile
@@ -96,6 +96,9 @@
 	rk3288-veyron-speedy.dtb \
 	rk3288-vyasa.dtb
 
+dtb-$(CONFIG_ROCKCHIP_RK3308) += \
+	rk3308-evb.dtb
+
 dtb-$(CONFIG_ROCKCHIP_RK3328) += \
 	rk3328-evb.dtb \
 	rk3328-rock64.dtb