board: toradex: imx: Remove not needed env variables

Remove not needed variables from environment and include config files.

 - setup variable used to be executed from some bootscript, however
   it's not required and there is no point on having this small helper
   here
 - boot_file, kernel_file, ip_dyn variables are not used anywhere
 - fdt_fixup variable is just set empty
 - defargs, vidargs variables used to be used from some bootscript,
   however there is no point on having it here and even old legacy
   bootscript can work without them
 - removed CONFIG_ENABLE_DDR_TRAINING_DEBUG, this is a leftover from
   some copy/paste

On colibri imx6ull/imx7 NAND module, remove consoleblank=0, this is
already the Linux kernel default therefore useless.

Various Linux Kernel command line options removed are not-existing
left-over that applied to some old NXP i.MX downstream branch

Signed-off-by: Francesco Dolcini <francesco.dolcini@toradex.com>
diff --git a/include/configs/colibri-imx6ull.h b/include/configs/colibri-imx6ull.h
index 561a61e..7c9d633 100644
--- a/include/configs/colibri-imx6ull.h
+++ b/include/configs/colibri-imx6ull.h
@@ -48,8 +48,8 @@
 	"ubiargs=ubi.mtd=ubi root=ubi0:rootfs rw rootfstype=ubifs " \
 		"ubi.fm_autoconvert=1\0" \
 	"ubiboot=run setup; " \
-		"setenv bootargs ${defargs} ${ubiargs} " \
-		"${setupargs} ${vidargs} ${tdxargs}; echo Booting from NAND...; " \
+		"setenv bootargs ${ubiargs} " \
+		"${setupargs} ${tdxargs}; echo Booting from NAND...; " \
 		"ubi part ubi &&" \
 		"ubi read ${kernel_addr_r} kernel && " \
 		"ubi read ${fdt_addr_r} dtb && " \
@@ -86,11 +86,7 @@
 	UBOOT_UPDATE \
 	"boot_script_dhcp=boot.scr\0" \
 	"console=ttymxc0\0" \
-	"defargs=user_debug=30\0" \
 	"fdt_board=eval-v3\0" \
-	"fdt_fixup=;\0" \
-	"ip_dyn=yes\0" \
-	"kernel_file=zImage\0" \
 	"setethupdate=if env exists ethaddr; then; else setenv ethaddr " \
 		"00:14:2d:00:00:00; fi; tftpboot ${loadaddr} " \
 		"${board}/flash_eth.img && source ${loadaddr}\0" \
@@ -99,7 +95,7 @@
 		"${board}/flash_blk.img && source ${loadaddr}\0" \
 	"setup=setenv setupargs " \
 		"console=tty1 console=${console}" \
-		",${baudrate}n8 ${memargs} ${mtdparts} consoleblank=0\0" \
+		",${baudrate}n8 ${memargs} ${mtdparts}\0" \
 	"setupdate=run setsdupdate || run setusbupdate || run setethupdate\0" \
 	"setusbupdate=usb start && setenv interface usb && " \
 		"fatload ${interface} 0:1 ${loadaddr} " \