RDMA/rtrs: include client and server modules into kernel compilation

Add rtrs Makefile, Kconfig and also corresponding lines into upper layer
infiniband/ulp files.

Link: https://lore.kernel.org/r/20200511135131.27580-14-danil.kipnis@cloud.ionos.com
Signed-off-by: Danil Kipnis <danil.kipnis@cloud.ionos.com>
Signed-off-by: Jack Wang <jinpu.wang@cloud.ionos.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
diff --git a/drivers/infiniband/Kconfig b/drivers/infiniband/Kconfig
index ade8638..477418b 100644
--- a/drivers/infiniband/Kconfig
+++ b/drivers/infiniband/Kconfig
@@ -107,6 +107,7 @@
 
 source "drivers/infiniband/ulp/iser/Kconfig"
 source "drivers/infiniband/ulp/isert/Kconfig"
+source "drivers/infiniband/ulp/rtrs/Kconfig"
 
 source "drivers/infiniband/ulp/opa_vnic/Kconfig"