[MIPS] Make facility to convert CPU types to strings generally available.

So far /proc/cpuinfo has been the only user but human readable processor
name are more useful than that for proc.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

include/asm-mips/cpu-info.h

@@ -74,4 +74,7 @@ extern struct cpuinfo_mips cpu_data[];
 extern void cpu_probe(void);
 extern void cpu_report(void);
 
+extern const char *__cpu_name[];
+#define cpu_name_string()	__cpu_name[smp_processor_id()]
+
 #endif /* __ASM_CPU_INFO_H */