Blackfin arch: fix typo... we want csync in CSYNC(), not ssync

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

diff --git a/include/asm-blackfin/blackfin.h b/include/asm-blackfin/blackfin.h
index 5ecf0aa..3c6e597 100644
--- a/include/asm-blackfin/blackfin.h
+++ b/include/asm-blackfin/blackfin.h
@@ -71,7 +71,7 @@
 			"nop;"
 			"nop;"
 			"nop;"
-			"ssync;"
+			"csync;"
 		);
 	else
 		__asm__ __volatile__("csync;");