IB/ipath: kbuild infrastructure

Integrate the ipath core and OpenIB drivers into the kernel build
infrastructure.  Add entry to MAINTAINERS.

Signed-off-by: Bryan O'Sullivan <bos@pathscale.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
diff --git a/drivers/infiniband/Kconfig b/drivers/infiniband/Kconfig
index bdf0891..afc612b 100644
--- a/drivers/infiniband/Kconfig
+++ b/drivers/infiniband/Kconfig
@@ -30,6 +30,7 @@
 	  <http://www.openib.org>.
 
 source "drivers/infiniband/hw/mthca/Kconfig"
+source "drivers/infiniband/hw/ipath/Kconfig"
 
 source "drivers/infiniband/ulp/ipoib/Kconfig"