staging: comedi: labpc: fix isadma dependency

When COMEDI_NI_LABPC is built-in and COMEDI_NI_LABPC_ISA is a loadable
module, thhe ISA DMA code is not reachable by the common module, causing
a link error:

drivers/staging/built-in.o: In function `labpc_interrupt':
ni_labpc_common.c:(.text+0x1d178): undefined reference to `labpc_handle_dma_status'
ni_labpc_common.c:(.text+0x1d1cb): undefined reference to `labpc_drain_dma'
drivers/staging/built-in.o: In function `labpc_ai_cmd':
ni_labpc_common.c:(.text+0x1d8ad): undefined reference to `labpc_setup_dma'

This changes the definition of COMEDI_NI_LABPC_ISADMA so that it will
also be builtin for that case. This looks like a rather old bug, but
I have never seen this in randconfig testing until today.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/comedi/Kconfig

@@ -505,7 +505,6 @@ config COMEDI_NI_ATMIO16D
 config COMEDI_NI_LABPC_ISA
 	tristate "NI Lab-PC and compatibles ISA support"
 	select COMEDI_NI_LABPC
-	select COMEDI_NI_LABPC_ISADMA if ISA_DMA_API
 	---help---
 	  Enable support for National Instruments Lab-PC and compatibles
 	  Lab-PC-1200, Lab-PC-1200AI, Lab-PC+.
@@ -1315,6 +1314,9 @@ config COMEDI_NI_LABPC
 
 config COMEDI_NI_LABPC_ISADMA
 	tristate
+	default COMEDI_NI_LABPC
+	depends on COMEDI_NI_LABPC_ISA != n
+	depends on ISA_DMA_API
 	select COMEDI_ISADMA
 
 config COMEDI_NI_TIO