binfmt_flat: use fixed size type for the on-disk format

So far binfmt_flat has only been supported on 32-bit platforms, so the
variable size of the fields didn't matter.  But the upcoming RISC-V
nommu port supports 64-bit CPUs, and we now have a conflict between
the elf2flt creation tool that always uses 32-bit fields and the kernel
that uses (unsigned) long field.  Switch to the userspace view as the
rest of the binfmt_flat format is completely architecture neutral,
and binfmt_flat isn't the right binary format for huge executables to
start with.

While we're at it also ensure these fields are using __be types as
they big endian and are byte swapped when loaded.

Signed-off-by: Christoph Hellwig <[email protected]>
Reviewed-by: Vladimir Murzin <[email protected]>
Signed-off-by: Greg Ungerer <[email protected]>

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