ehea: Fix missing Kconfig dependency

Fixed Kconfig: ehea driver requires sparse mem

Signed-off-by: Thomas Klein <tklein@de.ibm.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig
index a0f0e60..a64bb41 100644
--- a/drivers/net/Kconfig
+++ b/drivers/net/Kconfig
@@ -2519,7 +2519,7 @@
 
 config EHEA
 	tristate "eHEA Ethernet support"
-	depends on IBMEBUS && INET
+	depends on IBMEBUS && INET && SPARSEMEM
 	select INET_LRO
 	---help---
 	  This driver supports the IBM pSeries eHEA ethernet adapter.