cmd: ximg: Respect cache line size for flushing

Make sure that the cache line size if respected when flushing the cache.

Signed-off-by: Mario Six <mario.six@gdsys.cc>

cmd/ximg.c

@@ -249,7 +249,7 @@ do_imgextract(cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
 		puts("OK\n");
 	}
 
-	flush_cache(dest, len);
+	flush_cache(dest, ALIGN(len, ARCH_DMA_MINALIGN));
 
 	env_set_hex("fileaddr", data);
 	env_set_hex("filesize", len);