configs: dragonboard410c: remove env partition offset

BOOT2 is not partitioned, no need for partition offset.

Signed-off-by: Ramon Fried <ramon.fried@gmail.com>

arch/arm/dts/dragonboard410c-uboot.dtsi

@@ -6,10 +6,6 @@
  */
 
 / {
-	config {
-		u-boot,mmc-env-partition = "boot";
-	};
-
 	soc {
 		u-boot,dm-pre-reloc;