Blackfin arch: spelling fixes

Signed-off-by: Simon Arlott <simon@fire.lp0.eu>
Signed-off-by: Bryan Wu <bryan.wu@analog.com>

diff --git a/arch/blackfin/mach-bf533/boards/ezkit.c b/arch/blackfin/mach-bf533/boards/ezkit.c
index 747298e..0b522d9 100644
--- a/arch/blackfin/mach-bf533/boards/ezkit.c
+++ b/arch/blackfin/mach-bf533/boards/ezkit.c
@@ -1,6 +1,6 @@
 /*
  * File:         arch/blackfin/mach-bf533/ezkit.c
- * Based on:     Orginal Work
+ * Based on:     Original Work
  * Author:       Aidan Williams <aidan@nicta.com.au>
  *
  * Created:      2005