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At the moment we limit the maximum SPL load size to 32 KB, because this
was a BROM limit in previous SoCs.
Newer SoCs (H6 and later) lift this limit, but also this tool is not
bound by the BROM limit, since we can load any size.

Use the just introduced SRAM size to establish an upper limit for the
SPL size, then limit this as we go if any part of the memory is used for
the FEL backup buffers.

Given the buffer addresses chosen wisely, this can drastically increase
the maximum SPL load size, even on those SoCs with a 32KB BROM limit.
Signed-off-by: Andre Przywara <osp@andrep.de>