Remove stale "depends on NETDEV_1000"in staging drivers

Mark Einon points out that the Kconfig option for NETDEV_1000 no longer
exists, and the merge of the staging drivers should have removed that
for the et131x driver.

And while checking for it, I noticed that slicoss had the same stale
dependency.  Remove that one too.
Reported-by: Mark Einon <mark.einon@gmail.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/staging/et131x/Kconfig

 config ET131X
 	tristate "Agere ET-1310 Gigabit Ethernet support"
-	depends on NETDEV_1000 && PCI
+	depends on PCI
 	default n
 	---help---
 	  This driver supports Agere ET-1310 ethernet adapters.

drivers/staging/slicoss/Kconfig

 config SLICOSS
 	tristate "Alacritech Gigabit IS-NIC support"
-	depends on PCI && X86 && NETDEV_1000
+	depends on PCI && X86
 	default n
 	help
 	  This driver supports Alacritech's IS-NIC gigabit ethernet cards.