Blackfin arch: Cleanup no functional changes

Singed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>

diff --git a/arch/blackfin/kernel/gptimers.c b/arch/blackfin/kernel/gptimers.c
index e698554..3a3e961 100644
--- a/arch/blackfin/kernel/gptimers.c
+++ b/arch/blackfin/kernel/gptimers.c
@@ -10,8 +10,8 @@
 
 #include <linux/kernel.h>
 #include <linux/module.h>
+#include <linux/io.h>
 
-#include <asm/io.h>
 #include <asm/blackfin.h>
 #include <asm/gptimers.h>