dmaengine: ioat: Make two symbols static

This eliminates the following sparse warning:

drivers/dma/ioat/dma.c:29:5: warning: symbol 'completion_timeout' was
not declared. Should it be static?
drivers/dma/ioat/dma.c:33:5: warning: symbol 'idle_timeout' was not
declared. Should it be static?

Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Jason Yan <yanaijie@huawei.com>
Acked-by: Dave Jiang <dave.jiang@intel.com>
Link: https://lore.kernel.org/r/20200912072158.602585-1-yanaijie@huawei.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

drivers/dma/ioat/dma.c

@@ -26,11 +26,11 @@
 
 #include "../dmaengine.h"
 
-int completion_timeout = 200;
+static int completion_timeout = 200;
 module_param(completion_timeout, int, 0644);
 MODULE_PARM_DESC(completion_timeout,
 		"set ioat completion timeout [msec] (default 200 [msec])");
-int idle_timeout = 2000;
+static int idle_timeout = 2000;
 module_param(idle_timeout, int, 0644);
 MODULE_PARM_DESC(idle_timeout,
 		"set ioat idel timeout [msec] (default 2000 [msec])");