IB/hfi1: Add PSM2 user space header to header_install

When the hfi1 driver was added a user space header file (hfi1_user.h) was added
to be shared between PSM2 and the driver. However, the file was not added to
the header install. Add it now.

Fixes: d4ab347005fb ("IB/core: Add core header changes needed for OPA")
Signed-off-by: Ira Weiny <[e-mail]>
Signed-off-by: Doug Ledford <[e-mail]>

include/uapi/rdma/Kbuild

···
 header-y += ib_user_verbs.h
 header-y += rdma_netlink.h
 header-y += rdma_user_cm.h
+header-y += hfi/

include/uapi/rdma/hfi/Kbuild

···
+# UAPI Header export list
+header-y += hfi1_user.h