net: phy: LAN937x: add interrupt support for link detection

Added the config_intr and handle_interrupt for the LAN937x phy which is
same as the LAN87xx phy.

Signed-off-by: Arun Ramadoss <arun.ramadoss@microchip.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Link: https://lore.kernel.org/r/20220423154727.29052-1-arun.ramadoss@microchip.com


Signed-off-by: Paolo Abeni <pabeni@redhat.com>