Z8k: fix sout/soudb opcodes with direct address

Z8k: fix sout/soudb opcodes with direct address

Problem found by Tadashi G. Takaoka.

2020-08-04  Christian Groessler  <chris@groessler.org>
     Tadashi G. Takaoka <tadashi.g.takaoka@gmail.com>

 * z8kgen.c (opt): Fix "sout imm16,rs" and "soutb imm16,rbs"
 opcodes (special "out" to absolute address).
 * z8k-opc.h: Regenerate.

2020-08-04  Christian Groessler  <chris@groessler.org>

 * gas/testsuite/gas/z8k/inout.d: Adapt to correct encoding of
 "sout/soutb #imm,reg"