staging/rdma/hfi1: Move macros to a common header

In preparation of implementing TID caching move EXP_TID macros to a common
header user_exp_rcv.h

Signed-off-by: Mitko Haralanov <mitko.haralanov@intel.com>
Signed-off-by: Ira Weiny <ira.weiny@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>