colibri_imx6: provide fdtfile in env instead of setting it in runtime

Provide fdtfile value in default env instead of setting
it dynamically in runtime.

Fixes: 85cb2bc6("apalis/colibri imx6: provide proper fdtfile value")
Signed-off-by: Igor Opaniuk <igor.opaniuk@toradex.com>

include/configs/colibri_imx6.h

@@ -118,7 +118,7 @@
 #define FDT_FILE "imx6dl-colibri-eval-v3.dtb"
 #define CONFIG_EXTRA_ENV_SETTINGS \
 	BOOTENV \
-	"bootcmd=setenv fdtfile ${fdt_file}; run distro_bootcmd; " \
+	"bootcmd=run distro_bootcmd; " \
 		"usb start ; " \
 		"setenv stdout serial,vidconsole; " \
 		"setenv stdin serial,usbkbd\0" \
@@ -126,6 +126,7 @@
 	"console=ttymxc0\0" \
 	"defargs=enable_wait_mode=off galcore.contiguousSize=50331648\0" \
 	"fdt_file=" FDT_FILE "\0" \
+	"fdtfile=" FDT_FILE "\0" \
 	"fdt_fixup=;\0" \
 	MEM_LAYOUT_ENV_SETTINGS \
 	NFS_BOOTCMD \