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At the moment we always use a 32KB offset to place the U-Boot image
after the SPL.
Newer SoCs can (and will) have bigger SPLs, so we need to become more
flexible with this offset.

Read the actual SPL size, and assume the U-Boot payload is located right
behind the SPL, if the SPL size is bigger than 32KB.
We use at least 32KB, because this is how U-Boot is doing it today, even
when the SPL size is actually smaller than that.
Signed-off-by: Andre Przywara <osp@andrep.de>