RISC-V: detach funct-values from their offset

Rather than defining funct3, funct4, etc values pre-shifted to their
target-position in an instruction, define the values themselves and
only shift them where needed.

This allows using these funct-values in other places as well, for example
when decoding functions.

At the same time also reduces the use of magic numbers, one would need
a spec manual to understand.

Reviewed-by: Conor Dooley <[email protected]>
Reviewed-by: Andrew Jones <[email protected]>
Reviewed-by: Lad Prabhakar <[email protected]>
Signed-off-by: Heiko Stuebner <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Palmer Dabbelt <[email protected]>

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