s390/disassembler: add sthyi instruction

This instruction came with a z/VM extension and not with a specific
machine generation.
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

arch/s390/kernel/dis.c

@@ -865,6 +865,7 @@ static struct s390_insn opcode_b2[] = {
 	{ "msr", 0x52, INSTR_RRE_RR },
 	{ "mvpg", 0x54, INSTR_RRE_RR },
 	{ "mvst", 0x55, INSTR_RRE_RR },
+	{ "sthyi", 0x56, INSTR_RRE_RR },
 	{ "cuse", 0x57, INSTR_RRE_RR },
 	{ "bsg", 0x58, INSTR_RRE_RR },
 	{ "bsa", 0x5a, INSTR_RRE_RR },