ARM: dts: lan966x: add reset switch reset node

Add the switch reset node which will later be used by the switch driver.
The switch reset also resets the GPIO controller and the SGPIO
controller, thus it also has to be connectected to these nodes. This way
the reset will only issued once for the first device requesting the
reset.

Signed-off-by: Michael Walle <michael@walle.cc>
Reviewed-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Tested-by: Horatiu Vultur <horatiu.vultur@microchip.com>
Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Link: https://lore.kernel.org/r/20220502224127.2604333-11-michael@walle.cc


Signed-off-by: Nicolas Ferre <nicolas.ferre@microchip.com>