sparc32: Trivial removal of sun4c references in comments.

I left some around, like the ones in the openprom headers, since
we need to think about which pieces of those datastructures and
code we can completely toss now.

Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/arch/sparc/kernel/irq_64.c b/arch/sparc/kernel/irq_64.c
index dff2c3d..9bcbbe2 100644
--- a/arch/sparc/kernel/irq_64.c
+++ b/arch/sparc/kernel/irq_64.c
@@ -799,7 +799,7 @@
 	prom_limit0 = prom_timers->limit0;
 	prom_limit1 = prom_timers->limit1;
 
-	/* Just as in sun4c/sun4m PROM uses timer which ticks at IRQ 14.
+	/* Just as in sun4c PROM uses timer which ticks at IRQ 14.
 	 * We turn both off here just to be paranoid.
 	 */
 	prom_timers->limit0 = 0;