watchdog: atmel_sam: enable build for all SAM family
watchdog: atmel_sam: enable build for all SAM family

atmel_sam watchdog driver was temporarily limited to SAME70
series only. Now that all SAM series are using ASF the
change can be reverted.

Signed-off-by: Piotr Mienkowski <be7d9ab625d3cb5e3a4a3202f3529b954dba084c@gmail.com>

bigdinotech/zephyr,bigdinotech/zephyr,bigdinotech/zephyr,bigdinotech/zephyr,bigdinotech/zephyr