net: pcs: xpcs: drop interface argument from internal functions

Now that we no longer use the "interface" argument when creating the
XPCS sub-driver, remove it from xpcs_create() and xpcs_init_iface().

Reviewed-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Link: https://patch.msgid.link/E1svfMG-005ZI9-3k@rmk-PC.armlinux.org.uk


Signed-off-by: Jakub Kicinski <kuba@kernel.org>