net: dsa: ksz: Add reset GPIO handling

net: dsa: ksz: Add reset GPIO handling

Add code to handle optional reset GPIO in the KSZ switch driver. The switch
has a reset GPIO line which can be controlled by the CPU, so make sure it is
configured correctly in such setups.

Signed-off-by: Marek Vasut <[email protected]>
Cc: Vivien Didelot <[email protected]>
Cc: Woojung Huh <[email protected]>
Cc: David S. Miller <[email protected]>
Cc: Tristram Ha <[email protected]>
Reviewed-by: Andrew Lunn <[email protected]>
Signed-off-by: David S. Miller <[email protected]>