colibri vf50/61: fix various issues

Change to a Toradex email address.
Properly handle malloc return value.
Re-implement memory kernel argument passing in order to properly use
all available memory even on our currently used kernel.
Re-integrate U-Boot board size limit checking.
Re-add CMD_ASKENV and CMD_EXT2 but disable CMD_FLASH and CMD_LOADB/S
again.
Get rid of spurious double CMD_BOOTZ define.
Enable VERSION_VARIABLE in order to be able to check U-Boot version
from our update scripts.
Change boot delay to zero and enable ZERO_BOOTDELAY_CHECK to be more
in-line with our other BSPs.
Re-integrate vidargs environment handling.
Added setupdate command introduced on Apalis iMX6 to ease update
procedure from SD card.

While at it ran it through checkpatch.pl and cleaned it up.

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