Update environemt

Author: mattiaswal

src/board/raspberry-pi-4/uboot/rpi-env.dtso

@@ -17,8 +17,7 @@
 			stdin = "serial";
 			splashpos = "m,m";
 			splashfile = "splash.bmp";
-			splashimage = "0x20000000";
-			bootcmd = "fatload mmc 0:1 ${splashimage} ${splashfile}; bmp display ${splashimage}; run ixboot";
+			bootcmd = "fatload mmc 0:1 ${loadaddr} ${splashfile}; bmp display ${loadaddr}; run ixboot";
 
 			ixpreboot     = /incbin/("scripts/ixpreboot.sh");
 			ixbtn-devmode = "setenv dev_mode yes; echo Enabled";