net: phy: broadcom: Fix RGMII delays configuration for BCM54210E

commit fea7fda7 upstream.

Commit 0fc9ae10 ("net: phy: broadcom: add support for
BCM54210E") added support for BCM54210E but also unconditionally cleared
the RXC to RXD skew and the TXD to TXC skew, thus only making
PHY_INTERFACE_MODE_RGMII a possible configuration. Use
bcm54xx_config_clock_delay() which correctly sets the registers
depending on the 4 possible PHY interface values that exist for RGMII.

Fixes: 0fc9ae10 ("net: phy: broadcom: add support for BCM54210E")
Reported-by: Manasa Mudireddy <manasa.mudireddy@broadcom.com>
Reported-by: Ray Jui <ray.jui@broadcom.com>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>