xprtrdma: Squelch "max send, max recv" messages at connect time

Clean up: This message was intended to be a dprintk, as it is on the
server-side.

Fixes: 87cfb9a0 ('xprtrdma: Client-side support for ...')
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>