phycore_imx8mm: Move default bootcmd to board env

Move the default bootcmd from the defconfig to the board environment.

Signed-off-by: Yunus Bas <y.bas@phytec.de>
diff --git a/board/phytec/phycore_imx8mm/phycore_imx8mm.env b/board/phytec/phycore_imx8mm/phycore_imx8mm.env
index 33a2595..44fa373 100644
--- a/board/phytec/phycore_imx8mm/phycore_imx8mm.env
+++ b/board/phytec/phycore_imx8mm/phycore_imx8mm.env
@@ -1,3 +1,12 @@
+bootcmd=
+	mmc dev ${mmcdev};
+	if mmc rescan; then
+		if run loadimage; then
+			run mmcboot;
+		else
+			run netboot;
+		fi;
+	fi;
 console=ttymxc2,115200
 emmc_dev=2
 fdt_addr_r=0x48000000
diff --git a/configs/phycore-imx8mm_defconfig b/configs/phycore-imx8mm_defconfig
index c245804..3f43368 100644
--- a/configs/phycore-imx8mm_defconfig
+++ b/configs/phycore-imx8mm_defconfig
@@ -31,8 +31,6 @@
 CONFIG_FIT_EXTERNAL_OFFSET=0x3000
 CONFIG_SPL_LOAD_FIT=y
 CONFIG_OF_SYSTEM_SETUP=y
-CONFIG_USE_BOOTCOMMAND=y
-CONFIG_BOOTCOMMAND="mmc dev ${mmcdev}; if mmc rescan; then if run loadimage; then run mmcboot; else run netboot; fi; fi;"
 CONFIG_DEFAULT_FDT_FILE="oftree"
 CONFIG_SYS_CBSIZE=2048
 CONFIG_SYS_PBSIZE=2074