target/xtensa: fix pasto in pfwait.r opcode name

Core xtensa opcode table has pfwait.o instead of pfwait.r. Fix that.

Fixes: c884400 ("target/xtensa: implement block prefetch option opcodes")
Signed-off-by: Max Filippov <[email protected]>

Author: jcmvbkbc

target/xtensa/translate.c

@@ -3746,7 +3746,7 @@ static const XtensaOpcodeOps core_ops[] = {
         .name = "pfwait.a",
         .translate = translate_nop,
     }, {
-        .name = "pfwait.o",
+        .name = "pfwait.r",
         .translate = translate_nop,
     }, {
         .name = "pitlb",