net: phy: dp83867: Fix various styling and space issues

Fix spacing issues reported for misaligned switch..case and extra new
lines.

Also updated the file header to comply with networking commet style.
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Dan Murphy <dmurphy@ti.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/phy/dp83867.c

 // SPDX-License-Identifier: GPL-2.0
-/*
- * Driver for the Texas Instruments DP83867 PHY
+/* Driver for the Texas Instruments DP83867 PHY
  *
  * Copyright (C) 2015 Texas Instruments Inc.
  */
@@ -113,7 +112,6 @@
 #define DP83867_RGMII_RX_CLK_DELAY_SHIFT	0
 #define DP83867_RGMII_RX_CLK_DELAY_INV	(DP83867_RGMII_RX_CLK_DELAY_MAX + 1)
 
-
 /* IO_MUX_CFG bits */
 #define DP83867_IO_MUX_CFG_IO_IMPEDANCE_MASK	0x1f
 #define DP83867_IO_MUX_CFG_IO_IMPEDANCE_MAX	0x0
@@ -529,7 +527,6 @@ static int dp83867_of_init(struct phy_device *phydev)
 	dp83867->sgmii_ref_clk_en = of_property_read_bool(of_node,
 							  "ti,sgmii-ref-clock-output-enable");
 
-
 	dp83867->rx_id_delay = DP83867_RGMII_RX_CLK_DELAY_INV;
 	ret = of_property_read_u32(of_node, "ti,rx-internal-delay",
 				   &dp83867->rx_id_delay);