sparc64: Clean up CPU chip type probing code.

Three main things:

1) Make prober an arch initcall instead of using hard-coded invocation
   from paging_init()

2) Shrink table size, the fpu ident stuff was never used.

3) Use named struct initialized in table.

Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/arch/sparc64/kernel/entry.h b/arch/sparc64/kernel/entry.h
index 2255244..34d7ab5 100644
--- a/arch/sparc64/kernel/entry.h
+++ b/arch/sparc64/kernel/entry.h
@@ -5,8 +5,8 @@
 #include <linux/types.h>
 #include <linux/init.h>
 
-extern char *sparc_cpu_type;
-extern char *sparc_fpu_type;
+extern const char *sparc_cpu_type;
+extern const char *sparc_fpu_type;
 
 extern void __init per_cpu_patch(void);
 extern void __init sun4v_patch(void);