mlx4_core: Remove unnecessary includes of <linux/init.h>

Lots of mlx4 files with no function annotations included <linux/init.h>
for no reason.

Signed-off-by: Roland Dreier <rolandd@cisco.com>

drivers/net/mlx4/cq.c

@@ -34,7 +34,6 @@
  * SOFTWARE.
  */
 
-#include <linux/init.h>
 #include <linux/hardirq.h>
 
 #include <linux/mlx4/cmd.h>