MAINTAINERS: update ipath owner

I'll be leaving QLogic soon for another job and Ralph has graciously
offered to take over the IPath driver maintainership.

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

MAINTAINERS

@@ -2143,7 +2143,7 @@ L:	netdev@vger.kernel.org
 S:	Maintained
 
 IPATH DRIVER:
-P:	Arthur Jones
+P:	Ralph Campbell
 M:	infinipath@qlogic.com
 L:	general@lists.openfabrics.org
 T:	git git://git.qlogic.com/ipath-linux-2.6