net: phy: fixed_phy: remove irq argument from fixed_phy_add

All callers pass PHY_POLL, therefore remove irq argument from
fixed_phy_add().

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Reviewed-by: Florian Fainelli <florian.fainelli@broadcom.com>
Acked-by: Greg Ungerer <gerg@linux-m68k.org>
Link: https://patch.msgid.link/b3b9b3bc-c310-4a54-b376-c909c83575de@gmail.com


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