Blackfin arch: cleanup warnings from checkpatch -- no functional changes

Signed-off-by: Mike Frysinger <michael.frysinger@analog.com>
Signed-off-by: Bryan Wu <bryan.wu@analog.com>

diff --git a/arch/blackfin/mach-common/entry.S b/arch/blackfin/mach-common/entry.S
index 1560327..fa4e633 100644
--- a/arch/blackfin/mach-common/entry.S
+++ b/arch/blackfin/mach-common/entry.S
@@ -49,8 +49,8 @@
 
 
 #include <linux/linkage.h>
+#include <linux/unistd.h>
 #include <asm/blackfin.h>
-#include <asm/unistd.h>
 #include <asm/errno.h>
 #include <asm/thread_info.h>  /* TIF_NEED_RESCHED */
 #include <asm/asm-offsets.h>