arm64: dts: rockchip: set logo to center display for rk3399-linux

set uboot and kernel logo center display for linux product.

Change-Id: I481432b2719598b5d776eb39c4809c05dfb646b0
Signed-off-by: Sandy Huang <hjc@rock-chips.com>

Author: sandy-huang

arch/arm64/boot/dts/rockchip/rk3399-linux.dtsi

@@ -127,7 +127,7 @@
 			status = "disabled";
 			logo,uboot = "logo.bmp";
 			logo,kernel = "logo_kernel.bmp";
-			logo,mode = "fullscreen";
+			logo,mode = "center";
 			charge_logo,mode = "center";
 			connect = <&vopl_out_hdmi>;
 		};
@@ -136,7 +136,7 @@
 			status = "disabled";
 			logo,uboot = "logo.bmp";
 			logo,kernel = "logo_kernel.bmp";
-			logo,mode = "fullscreen";
+			logo,mode = "center";
 			charge_logo,mode = "center";
 			connect = <&vopb_out_dsi>;
 		};
@@ -145,7 +145,7 @@
 			status = "disabled";
 			logo,uboot = "logo.bmp";
 			logo,kernel = "logo_kernel.bmp";
-			logo,mode = "fullscreen";
+			logo,mode = "center";
 			charge_logo,mode = "center";
 			connect = <&vopb_out_edp>;
 		};