[RL78] Fix encoding of divwu insn

[nick clifton]

Hi Kaushik,

> 	gas/Changelog
> 	* rl78-parse.y: Fix encoding of divwu insn.
> 	opcodes/Changelog
> 	* rl78-decode.c: Fix encoding of divwu insn.
> 	* rl78-decode.opc: Ditto.

Applied.

Cheers
   Nick