sparc64: Provide extern decls for sparc_??u_type strings.

Signed-off-by: NDavid S. Miller <davem@davemloft.net>

arch/sparc/include/asm/system_64.h

@@ -29,6 +29,10 @@ enum sparc_cpu {
 /* This cannot ever be a sun4c :) That's just history. */
 #define ARCH_SUN4C 0
 
+extern const char *sparc_cpu_type;
+extern const char *sparc_fpu_type;
+extern const char *sparc_pmu_type;
+
 extern char reboot_command[];
 
 /* These are here in an effort to more fully work around Spitfire Errata