ARM: dts: at91: sama5d27_som1_ek: remove not connected CAN0

CAN0 is not connected on the sama5d27_som1_ek board, so remove
it from DT.

Signed-off-by: Nicolas Ferre <nicolas.ferre@microchip.com>
[claudiu.beznea@microchip.com: change subject to match the desired prefix]
Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>