staging: comedi: addi_apci_3501: prefer using the BIT macro

Change the register bit defines to use the BIT macro.
Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Reviewed-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/comedi/drivers/addi_apci_3501.c

@@ -33,12 +33,12 @@
  * PCI bar 1 register I/O map
  */
 #define APCI3501_AO_CTRL_STATUS_REG		0x00
-#define APCI3501_AO_CTRL_BIPOLAR		(1 << 0)
-#define APCI3501_AO_STATUS_READY		(1 << 8)
+#define APCI3501_AO_CTRL_BIPOLAR		BIT(0)
+#define APCI3501_AO_STATUS_READY		BIT(8)
 #define APCI3501_AO_DATA_REG			0x04
 #define APCI3501_AO_DATA_CHAN(x)		((x) << 0)
 #define APCI3501_AO_DATA_VAL(x)			((x) << 8)
-#define APCI3501_AO_DATA_BIPOLAR		(1 << 31)
+#define APCI3501_AO_DATA_BIPOLAR		BIT(31)
 #define APCI3501_AO_TRIG_SCS_REG		0x08
 #define APCI3501_TIMER_SYNC_REG			0x20
 #define APCI3501_TIMER_RELOAD_REG		0x24