ixgbe: cleanup short msleep's (<20ms) to use usleep_range

Since msleep might not sleep for the desired amount when less
than 20ms use usleep_range.

Signed-off-by: Don Skidmore <donald.c.skidmore@intel.com>
Tested-by: Stephen Ko <stephen.s.ko@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
diff --git a/drivers/net/ixgbe/ixgbe_x540.c b/drivers/net/ixgbe/ixgbe_x540.c
index 295c170..8aa1dc1 100644
--- a/drivers/net/ixgbe/ixgbe_x540.c
+++ b/drivers/net/ixgbe/ixgbe_x540.c
@@ -563,7 +563,7 @@
 			 * resource (swmask)
 			 */
 			ixgbe_release_swfw_sync_semaphore(hw);
-			msleep(5);
+			usleep_range(5000, 10000);
 		}
 	}
 
@@ -585,7 +585,7 @@
 		}
 	}
 
-	msleep(5);
+	usleep_range(5000, 10000);
 	return 0;
 }
 
@@ -609,7 +609,7 @@
 	IXGBE_WRITE_REG(hw, IXGBE_SWFW_SYNC, swfw_sync);
 
 	ixgbe_release_swfw_sync_semaphore(hw);
-	msleep(5);
+	usleep_range(5000, 10000);
 }
 
 /**