mips: Make mips64 n32/o32 userland possible or remove support completely

[Jeffery To]

Hi,

I've been looking into platform triplets for Python and figuring out
the possible combinations. This has led me to trying to compile images
of the possible combinations for testing.

As a result, I've been trying to compile malta/be64 with n32/o32
userland. I haven't been successful so far but before trying to fix
all the issues, I wanted to take a step back and ask a more general
question.

I see there is the option to select mips64 ABI in toolchain/Config.in.
On the other hand, there are commits like 46af22de16b2 ("kernel:
Remove CONFIG_COMPAT") and 38666e8ae42d ("malta: Deactivate MIPS O32
and N32 support") (and also the recent discussion with amd64 x32
support).

Is there a preference to make n32/o32 userland optional/possible, and
so I should continue trying to get it to work? Or is the preference to
remove support completely, so I should submit patches to do so?

Thanks,
Jeff