[ARM] spelling fixes

Spelling fixes in arch/arm/.

Signed-off-by: Simon Arlott <simon@fire.lp0.eu>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/arch/arm/mach-h720x/cpu-h7202.c b/arch/arm/mach-h720x/cpu-h7202.c
index 82e420d..0a1a25f 100644
--- a/arch/arm/mach-h720x/cpu-h7202.c
+++ b/arch/arm/mach-h720x/cpu-h7202.c
@@ -143,7 +143,7 @@
 }
 
 /*
- * mask multiplexed timer irq's
+ * mask multiplexed timer IRQs
  */
 static void inline mask_timerx_irq (u32 irq)
 {
@@ -153,7 +153,7 @@
 }
 
 /*
- * unmask multiplexed timer irq's
+ * unmask multiplexed timer IRQs
  */
 static void inline unmask_timerx_irq (u32 irq)
 {