cxgb3 does not currently report the page size capabilities, and
incorrectly reports them internally.

This version changes the bit-shifting to a static value (per Steve's
request).
Signed-off-by: NJon Mason <jon@opengridcomputing.com>
Acked-by: NSteve Wise <swise@opengridcomputing.com>
Signed-off-by: NRoland Dreier <rolandd@cisco.com>