[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/mm/mmu.c b/arch/arm/mm/mmu.c
index 2ba1530..02e050a 100644
--- a/arch/arm/mm/mmu.c
+++ b/arch/arm/mm/mmu.c
@@ -92,7 +92,7 @@
 };
 
 /*
- * These are useful for identifing cache coherency
+ * These are useful for identifying cache coherency
  * problems by allowing the cache or the cache and
  * writebuffer to be turned off.  (Note: the write
  * buffer should not be on and the cache off).