s390/thp: select HAVE_ARCH_TRANSPARENT_HUGEPAGE

Add missing select statement to arch/s390/Kconfig.

Signed-off-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index 3f3d9ca..5dba755 100644
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -130,6 +130,7 @@
 	select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
 	select HAVE_UID16 if 32BIT
 	select ARCH_WANT_IPC_PARSE_VERSION
+	select HAVE_ARCH_TRANSPARENT_HUGEPAGE if 64BIT
 	select GENERIC_SMP_IDLE_THREAD
 	select GENERIC_TIME_VSYSCALL_OLD
 	select GENERIC_CLOCKEVENTS