target/loongarch: Add generic CPU model information

On LoongArch system, CPU model name comes from IOCSR register
LOONGARCH_IOCSR_VENDOR and LOONGARCH_IOCSR_CPUNAME. Its value
can be initialized when CPU is created.

Signed-off-by: Bibo Mao <maobibo@loongson.cn>
Reviewed-by: Song Gao <gaosong@loongson.cn>
Signed-off-by: Song Gao <gaosong@loongson.cn>
3 files changed