phy: amlogic: meson8b-usb2: Use FIELD_PREP instead of _SHIFT macros

This simplifies the code by re-using the FIELD_PREP helper. No
functional changes inteded.

Reviewed-by: Neil Armstrong <[e-mail]>
Signed-off-by: Martin Blumenstingl <[e-mail]>
Reviewed-by: Anand Moon <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Vinod Koul <[e-mail]>

drivers/phy/amlogic/phy-meson8b-usb2.c

···
  * Copyright (C) 2016 Martin Blumenstingl <[e-mail]>
  */
 
+#include <linux/bitfield.h>
 #include <linux/clk.h>
 #include <linux/delay.h>
 #include <linux/io.h>
···
 	#define REG_CTRL_TX_BITSTUFF_ENN		BIT(18)
 	#define REG_CTRL_COMMON_ON			BIT(19)
 	#define REG_CTRL_REF_CLK_SEL_MASK		GENMASK(21, 20)
-	#define REG_CTRL_REF_CLK_SEL_SHIFT		20
 	#define REG_CTRL_FSEL_MASK			GENMASK(24, 22)
-	#define REG_CTRL_FSEL_SHIFT			22
 	#define REG_CTRL_PORT_RESET			BIT(25)
 	#define REG_CTRL_THREAD_ID_MASK			GENMASK(31, 26)
 
···
 			   REG_CONFIG_CLK_32k_ALTSEL);
 
 	regmap_update_bits(priv->regmap, REG_CTRL, REG_CTRL_REF_CLK_SEL_MASK,
-			   0x2 << REG_CTRL_REF_CLK_SEL_SHIFT);
+			   FIELD_PREP(REG_CTRL_REF_CLK_SEL_MASK, 0x2));
 
 	regmap_update_bits(priv->regmap, REG_CTRL, REG_CTRL_FSEL_MASK,
-			   0x5 << REG_CTRL_FSEL_SHIFT);
+			   FIELD_PREP(REG_CTRL_FSEL_MASK, 0x5));
 
 	/* reset the PHY */
 	regmap_update_bits(priv->regmap, REG_CTRL, REG_CTRL_POWER_ON_RESET,