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 <[e-mail]>
Signed-off-by: Jason Yan <[e-mail]>
Acked-by: Dave Jiang <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Vinod Koul <[e-mail]>

drivers/dma/ioat/dma.c

···
 
 #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])");