qede: Fix compilation without QED_RDMA

When CONFIG_QED_RDMA isn't defined, we'd hit the following:

/include/linux/qed/qede_rdma.h:84:19:
warning: ‘qede_rdma_dev_add’ used but never defined [enabled by default]
static inline int qede_rdma_dev_add(struct qede_dev *dev);

Fixes: bbfcd1e8e167 ("qed*: Set rdma generic functions prefix")
Signed-off-by: Chad Dupuis <[e-mail]>
Signed-off-by: Yuval Mintz <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

include/linux/qed/qede_rdma.h

···
 void qede_rdma_event_changeaddr(struct qede_dev *edr);
 
 #else
-static inline int qede_rdma_dev_add(struct qede_dev *dev);
+static inline int qede_rdma_dev_add(struct qede_dev *dev)
 {
 	return 0;
 }