i40iw: Replace mdelay with msleep in i40iw_wait_pe_ready

i40iw_wait_pe_ready is not called in an interrupt handler
nor holding a spinlock.
The function mdelay in it can be replaced with msleep,
to reduce busy wait.

Signed-off-by: Jia-Ju Bai <baijiaju1990@gmail.com>
Reviewed-by: Leon Romanovsky <leonro@mellanox.com>
Acked-by: Shiraz Saleem <shiraz.saleem@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

drivers/infiniband/hw/i40iw/i40iw_main.c

@@ -1290,7 +1290,7 @@ static void i40iw_wait_pe_ready(struct i40iw_hw *hw)
 			      __LINE__, statuscpu2);
 		if ((statuscpu0 == 0x80) && (statuscpu1 == 0x80) && (statuscpu2 == 0x80))
 			break;	/* SUCCESS */
-		mdelay(1000);
+		msleep(1000);
 		retrycount++;
 	} while (retrycount < 14);
 	i40iw_wr32(hw, 0xb4040, 0x4C104C5);