RDMA/rxe: Make rxe_type_info static const

Make struct rxe_type_info static const and local to the only uses.  Moves
a bit of data to text.

$ size drivers/infiniband/sw/rxe/rxe_pool.o* (defconfig w/ infiniband swe)
   text	   data	    bss	    dec	    hex	filename
   4456	     12	      0	   4468	   1174	drivers/infiniband/sw/rxe/rxe_pool.o.new
   3817	    652	      0	   4469	   1175	drivers/infiniband/sw/rxe/rxe_pool.o.old

Link: https://lore.kernel.org/r/166b715d71f98336e8ecab72b0dbdd266eee9193.camel@perches.com


Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>