staging: comedi: me4000: tidy up ME4000_AI_CHANNEL_LIST_REG bit defines

Use the BIT() macro to define the bits of this register.
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/me4000.c

@@ -110,9 +110,9 @@ broken.
 #define ME4000_AI_STATUS_BIT_FSM		(1 << 29)
 #define ME4000_AI_CTRL_BIT_EX_TRIG_BOTH		(1 << 31)
 #define ME4000_AI_CHANNEL_LIST_REG		0x78
-#define ME4000_AI_LIST_INPUT_DIFFERENTIAL	(1 << 5)
+#define ME4000_AI_LIST_INPUT_DIFFERENTIAL	BIT(5)
 #define ME4000_AI_LIST_RANGE(x)			((3 - ((x) & 3)) << 6)
-#define ME4000_AI_LIST_LAST_ENTRY		(1 << 8)
+#define ME4000_AI_LIST_LAST_ENTRY		BIT(8)
 #define ME4000_AI_DATA_REG			0x7c
 #define ME4000_AI_CHAN_TIMER_REG		0x80
 #define ME4000_AI_CHAN_PRE_TIMER_REG		0x84