riscv: allow different stages with alternatives

Future features may need to be applied at a different
time during boot, so allow defining stages for alternatives
and handling them differently depending on the stage.

Also make the alternatives-location more flexible so that
future stages may provide their own location.

Signed-off-by: Heiko Stuebner <[email protected]>
Reviewed-by: Philipp Tomsich <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Palmer Dabbelt <[email protected]>

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