[S390] Kconfig: refine depends statements.

Refine some depends statements to limit their visibility to the
environments that are actually supported.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/drivers/ieee1394/Kconfig b/drivers/ieee1394/Kconfig
index 61d7809..f21426a 100644
--- a/drivers/ieee1394/Kconfig
+++ b/drivers/ieee1394/Kconfig
@@ -1,4 +1,5 @@
 menu "IEEE 1394 (FireWire) support"
+	depends on PCI || BROKEN
 
 config IEEE1394
 	tristate "IEEE 1394 (FireWire) support"