sparc32: add irq + smp declarations to headers

In preparation for cleaning up a number of files add
declarations for irq and smp related data/functions to
the relevant headers.

This showed that the extern declaration of cputypval differed
in the two files where it was used.
As cputypval is defined like this:

cputypval:
        .asciz "sun4c"

the correct representation is a char array.
Fix users to use the new declaration.

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/arch/sparc/kernel/irq_32.c b/arch/sparc/kernel/irq_32.c
index 07c3e39..85db35d 100644
--- a/arch/sparc/kernel/irq_32.c
+++ b/arch/sparc/kernel/irq_32.c
@@ -130,9 +130,9 @@
 
 static void irq_panic(void)
 {
-    extern char *cputypval;
-    prom_printf("machine: %s doesn't have irq handlers defined!\n",cputypval);
-    prom_halt();
+	prom_printf("machine: %s doesn't have irq handlers defined!\n",
+		    &cputypval[0]);
+	prom_halt();
 }
 
 void (*sparc_init_timers)(irq_handler_t ) =