powerpc: Fix iseries drivers build failure without CONFIG_VIOPATH

iSeries dependent drivers fail to build, when CONFIG_VIOPATH is disabled.

Fix the problem by making those drivers select it.

Signed-off-by: Kamalesh Babulal <kamalesh@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
diff --git a/drivers/scsi/Kconfig b/drivers/scsi/Kconfig
index b732297..256c7be 100644
--- a/drivers/scsi/Kconfig
+++ b/drivers/scsi/Kconfig
@@ -884,6 +884,7 @@
 	tristate "IBM Virtual SCSI support"
 	depends on PPC_PSERIES || PPC_ISERIES
 	select SCSI_SRP_ATTRS
+	select VIOPATH if PPC_ISERIES
 	help
 	  This is the IBM POWER Virtual SCSI Client