configs: gardena-smart-gateway-at91sam: Adjust to production values

This commit updates the default config with the values that will be used
soon on the Atmel / Microchip AT91SAM9G25 based GARDENA smart gateway.

Signed-off-by: Reto Schneider <reto.schneider@husqvarnagroup.com>
Reviewed-by: Stefan Roese <sr@denx.de>
1 file changed