[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/common/gic.c b/arch/arm/common/gic.c
index 2ae0bd1..0c89bd3 100644
--- a/arch/arm/common/gic.c
+++ b/arch/arm/common/gic.c
@@ -72,7 +72,7 @@
  * unmask it, in the same way we need to unmask an interrupt when
  * we first enable it.
  *
- * The GIC has a seperate notion of "end of interrupt" to re-enable
+ * The GIC has a separate notion of "end of interrupt" to re-enable
  * an interrupt after handling, in order to support hardware
  * prioritisation.
  *