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Some processors have no IOCSR.VENDOR and IOCSR.CPUNAME, some processors have these registers but there is no valid information. Consolidate CPU names in /proc/cpuinfo: 1. Add "PRID" to display the PRID & Core-Name; 2. Let "Model Name" display "Unknown" if no valid name. Signed-off-by: Huacai Chen <chenhuacai@loongson.cn> Signed-off-by: maoxiaochuan <maoxiaochuan@loongson.cn>