[S390] disassembler: handle b280/spp instruction

arch/s390/kvm/sie64a.S uses the b280 instruction. Tell the builtin
disassembler to handle that code.

Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

arch/s390/kernel/dis.c

@@ -672,6 +672,7 @@ static struct insn opcode_b2[] = {
 	{ "rp", 0x77, INSTR_S_RD },
 	{ "stcke", 0x78, INSTR_S_RD },
 	{ "sacf", 0x79, INSTR_S_RD },
+	{ "spp", 0x80, INSTR_S_RD },
 	{ "stsi", 0x7d, INSTR_S_RD },
 	{ "srnm", 0x99, INSTR_S_RD },
 	{ "stfpc", 0x9c, INSTR_S_RD },