rdma: Move RDMA UAPI header file to be under RDMA responsibility

In iproute2 package, the updates of UAPIs files are performed
after the needed feature lands in kernel's net-next tree.

Such development flow created delays to the rdma tool developers,
who uses rdma-next tree as a basis for their work.

Move RDMA UAPI file to be under rdma/ folder, so whole responsibility
of syncing this file will be on them.

Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Reviewed-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: David Ahern <dsahern@gmail.com>

rdma/Makefile

@@ -4,6 +4,7 @@ include ../config.mk
 TARGETS :=
 
 ifeq ($(HAVE_MNL),y)
+CFLAGS += -I./include/uapi/
 
 RDMA_OBJ = rdma.o utils.o dev.o link.o res.o