cache: flush when invalidating cache, not only store it

Author: DacoTaco

libogc/system_asm.S

@@ -307,7 +307,7 @@ __flush_cache:
 	and		r5,r5,r3
 	subf	r3,r5,r3
 	add		r4,r4,r3
-1:	dcbst	r0,r5
+1:	dcbf    r0,r5
 	sync
 	icbi	r0,r5
 	addic	r5,r5,8