staging: comedi: adv_pci1724: remove enum sync_output_trigger_contents

This enum is not used in the driver. Remove it.

For aesthetics, rename the register define and move the comment that
any value will trigger the sync output.

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/adv_pci1724.c

@@ -72,13 +72,9 @@ supported PCI devices are configured as comedi devices automatically.
 #define PCI1724_SYNC_CTRL_DACSTAT	(1 << 1)
 #define PCI1724_SYNC_CTRL_SYN		(1 << 0)
 #define PCI1724_EEPROM_CTRL_REG		0x08
-#define PCI1724_SYNC_OUTPUT_TRIG_REG	0x0c
+#define PCI1724_SYNC_TRIG_REG		0x0c  /* any value works */
 #define PCI1724_BOARD_ID_REG		0x10
 
-enum sync_output_trigger_contents {
-	SYNC_TRIGGER_BITS = 0x0 /* any value works */
-};
-
 enum board_id_contents {
 	BOARD_ID_MASK = 0xf
 };