Fix configurable U-Boot attempt setting #716
Merged
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Commit ebbdb4b ("Make U-Boot attempt settings configurable") made
it possible to tweak the number of attempts that are set in the U-Boot
environment.
There is an issue with that because U-Boot's setexpr can only handle
hex, while in the current implementation those values are treated as
decimals.
To work around that, let's treat those numbers as hex everywhere.