IB: make INFINIBAND_ADDR_TRANS configurable

Allow INFINIBAND without INFINIBAND_ADDR_TRANS because fuzzing has been
finding fair number of CM bugs.  So provide option to disable it.

Signed-off-by: Greg Thelen <gthelen@google.com>
Cc: Tarick Bedeir <tarick@google.com>
Reviewed-by: Bart Van Assche <bart.vanassche@wdc.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

drivers/infiniband/Kconfig

@@ -61,9 +61,12 @@ config INFINIBAND_ON_DEMAND_PAGING
 	  pages on demand instead.
 
 config INFINIBAND_ADDR_TRANS
-	bool
+	bool "RDMA/CM"
 	depends on INFINIBAND
 	default y
+	---help---
+	  Support for RDMA communication manager (CM).
+	  This allows for a generic connection abstraction over RDMA.
 
 config INFINIBAND_ADDR_TRANS_CONFIGFS
 	bool