imx: imx8m{m,n,p}_venice: migrate to CONFIG_EXTRA_ENV_TEXT

Move the majority of the environment from the board headers to
a separate text file.

Signed-off-by: Tim Harvey <tharvey@gateworks.com>
diff --git a/board/gateworks/venice/venice.env b/board/gateworks/venice/venice.env
new file mode 100644
index 0000000..f81804c
--- /dev/null
+++ b/board/gateworks/venice/venice.env
@@ -0,0 +1,34 @@
+kernel_addr_r=0x48200000
+fdt_addr_r=0x50200000
+scriptaddr=0x50280000
+ramdisk_addr_r=0x50300000
+kernel_comp_addr_r=0x40200000
+script=boot.scr
+bootm_size=0x10000000
+dev=2
+preboot=gsc wd-disable
+console=ttymxc1,115200
+update_firmware=tftpboot $loadaddr $image &&
+	setexpr blkcnt $filesize + 0x1ff &&
+	setexpr blkcnt $blkcnt / 0x200 &&
+	mmc dev $dev &&
+	mmc write $loadaddr $splblk $blkcnt
+loadfdt=if $fsload $fdt_addr_r $dir/$fdt_file1;
+	then echo loaded $fdt_file1;
+	elif $fsload $fdt_addr_r $dir/$fdt_file2;
+	then echo loaded $fdt_file2;
+	elif $fsload $fdt_addr_r $dir/$fdt_file3;
+	then echo loaded $fdt_file3;
+	elif $fsload $fdt_addr_r $dir/$fdt_file4;
+	then echo loaded $fdt_file4;
+	elif $fsload $fdt_addr_r $dir/$fdt_file5;
+	then echo loaded $fdt_file5;
+	fi
+boot_net=setenv fsload tftpboot;
+	run loadfdt && tftpboot $kernel_addr_r $dir/Image &&
+	booti $kernel_addr_r - $fdt_addr_r
+update_rootfs=tftpboot $loadaddr $image &&
+	gzwrite mmc $dev $loadaddr $filesize 100000 1000000
+update_all=tftpboot $loadaddr $image &&
+	gzwrite mmc $dev $loadaddr $filesize
+erase_env=mmc dev $dev; mmc erase 0x7f08 0x40