phy: cadence: Sierra: remove redundant initialization of pointer regmap

The pointer regmap is being initialized with a value that is never
read and it is being updated later with a new value from
phy->regmap_common_cdb.  The initialization is redundant and can be
removed.

Addresses-Coverity: ("Unused value")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>

drivers/phy/cadence/phy-cadence-sierra.c

@@ -272,7 +272,7 @@ static int cdns_sierra_phy_init(struct phy *gphy)
 {
 	struct cdns_sierra_inst *ins = phy_get_drvdata(gphy);
 	struct cdns_sierra_phy *phy = dev_get_drvdata(gphy->dev.parent);
-	struct regmap *regmap = phy->regmap;
+	struct regmap *regmap;
 	int i, j;
 	struct cdns_reg_pairs *cmn_vals, *ln_vals;
 	u32 num_cmn_regs, num_ln_regs;