RISC-V: Add CONFIG_{NON,}PORTABLE

The RISC-V port has collected a handful of options that are
fundamentally non-portable.  To prevent users from shooting themselves
in the foot, hide them all behind a config entry that explicitly calls
out that non-portable binaries may be produced.

Signed-off-by: Palmer Dabbelt <[email protected]>
Reviewed-by: Arnd Bergmann <[email protected]>
Signed-off-by: Palmer Dabbelt <[email protected]>
Reviewed-by: Atish Patra <[email protected]>
Reviewed-by: Damien Le Moal <[email protected]>
Reviewed-by: Guo Ren <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Palmer Dabbelt <[email protected]>

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