[crypto] Separate out bigint_reduce() from bigint_mod_multiply()

Faster modular multiplication algorithms such as Montgomery
multiplication will still require the ability to perform a single
direct modular reduction.

Neaten up the implementation of direct reduction and split it out into
a separate bigint_reduce() function, complete with its own unit tests.

Signed-off-by: Michael Brown <mcb30@ipxe.org>

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