Revert raidz_map and _col structure types

As part of the refactoring of ab9f4b0b824ab4cc64a4fa382c037f4154de12d6,
several uint64_t-s and uint8_t-s were changed to other types.  This
caused ZoL github issue #6981, an overflow of a size_t on a 32-bit ARM
machine.  In absense of any strong motivation for the type changes, this
simply puts them back, modulo the changes accumulated for ABD.

Compile-tested on amd64 and run-tested on armhf.

Reviewed-by: Brian Behlendorf <[email protected]>
Reviewed-by: Gvozden Neskovic <[email protected]>
Signed-off-by: Nathaniel Wesley Filardo <[email protected]>
Closes #6981 
Closes #7023 

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