staging: comedi: addi_apci_1516: update the Kconfig

This driver does not use virt_to_bus(), remove the depends on for it.

Update the Kconfig entry to list all the boards supported by this
driver. Also, expand the help text a bit.
Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/comedi/Kconfig

@@ -594,10 +594,11 @@ config COMEDI_ADDI_APCI_1500
 	  called addi_apci_1500.
 
 config COMEDI_ADDI_APCI_1516
-	tristate "ADDI-DATA APCI-1516/2016 support"
-	depends on VIRT_TO_BUS
+	tristate "ADDI-DATA APCI-1016/1516/2016 support"
 	---help---
-	  Enable support for ADDI-DATA APCI-1516 and APCI-2016 boards.
+	  Enable support for ADDI-DATA APCI-1016, APCI-1516 and APCI-2016 boards.
+	  These are 16 channel, optically isolated, digital I/O boards. The 1516
+	  and 2016 boards also have a watchdog for resetting the outputs to "0".
 
 	  To compile this driver as a module, choose M here: the module will be
 	  called addi_apci_1516.