[opcodes] arc: Fix the address for "isa_config" aux reg

Author: Shahab Vahedi

opcodes/arc-regs.h

@@ -208,7 +208,7 @@ DEF (0xad,  ARC_OPCODE_ARCALL,  NONE, se_watch)
 DEF (0xc0,  ARC_OPCODE_ARCALL,  NONE, bpu_build)
 DEF (0xc1,  ARC_OPCODE_ARC600,  NONE, arc600_build_config)
 DEF (0xc1,  ARC_OPCODE_ARC700,  NONE, isa_config)
-DEF (0xc1,  ARC_OPCODE_ARCV2,   NONE, isa_config)
+DEF (0xc1,  ARC_OPCODE_ARCVx,   NONE, isa_config)
 DEF (0xf4,  ARC_OPCODE_ARCALL,  NONE, hwp_build)
 DEF (0xf5,  ARC_OPCODE_ARCALL,  NONE, pct_build)
 DEF (0xf6,  ARC_OPCODE_ARCALL,  NONE, cc_build)