target/loongarch: Remove duplicated disas_set_info assignment

Commit 228021f ("target/loongarch: Add core definition") sets
disas_set_info to loongarch_cpu_disas_set_info. Probably due to
a failed git-rebase, commit ca61e75 ("target/loongarch: Add gdb
support") also sets it to the same value. Remove the duplication.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Song Gao <gaosong@loongson.cn>
Message-Id: <20230821125959.28666-3-philmd@linaro.org>
Signed-off-by: Song Gao <gaosong@loongson.cn>

target/loongarch/cpu.c

@@ -723,7 +723,6 @@ static void loongarch_cpu_class_init(ObjectClass *c, void *data)
     cc->disas_set_info = loongarch_cpu_disas_set_info;
     cc->gdb_read_register = loongarch_cpu_gdb_read_register;
     cc->gdb_write_register = loongarch_cpu_gdb_write_register;
-    cc->disas_set_info = loongarch_cpu_disas_set_info;
     cc->gdb_num_core_regs = 35;
     cc->gdb_core_xml_file = "loongarch-base64.xml";
     cc->gdb_stop_before_watchpoint = true;