IB/ipath: Update MAINTAINERS entry

Bryan is no longer with QLogic and we now have a public git server and
a public email alias for infinipath driver patches.  And, as pointed
out by Hal Rosenstock, the mailing list has changed as well.

Signed-off-by: Arthur Jones <arthur.jones@qlogic.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>