Having the padding types as INT_MAX + 1 means C++ compilers will end up using
a signed 64 bit integer, as that is the only type that can have a value that
large, as well as the negative values our enums typically contain
Domains are unnecessarily treated explicitly as 8-bit values within boot info.
Though there are existing proof constraints that limit the maximum domain value
to 8 bits, most of the code would permit domain values up to 32 bits. The
maximum value is unnecessarily constrained in boot info, a restriction which
this commit removes.
Closes VER-341
