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

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

include/asm-blackfin/blackfin.h

@@ -71,7 +71,7 @@ static inline void CSYNC(void)
 			"nop;"
 			"nop;"
 			"nop;"
-			"ssync;"
+			"csync;"
 		);
 	else
 		__asm__ __volatile__("csync;");