vhost_scsi: module rename

Rename module and update Kconfig and Makefile.
Add alias for compatibility with old userspace
scripts if any.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Asias He <asias@redhat.com>
Acked-by: Nicholas Bellinger <nab@linux-iscsi.org>
diff --git a/drivers/vhost/Makefile b/drivers/vhost/Makefile
index 6ea9cec..ef21d5f 100644
--- a/drivers/vhost/Makefile
+++ b/drivers/vhost/Makefile
@@ -1,5 +1,5 @@
 obj-$(CONFIG_VHOST_NET) += vhost_net.o
 vhost_net-y := vhost.o net.o
 
-obj-$(CONFIG_TCM_VHOST) += tcm_vhost.o
-tcm_vhost-y := scsi.o
+obj-$(CONFIG_VHOST_SCSI) += vhost_scsi.o
+vhost_scsi-y := scsi.o