ARM: dts: at91: sam9x60ek: remove status = "okay" for regulators

Remove status = "okay" for sam9x60ek regulator as okay is the default
status.

Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Link: https://lore.kernel.org/r/20221026124114.985876-12-claudiu.beznea@microchip.com