platform: andes/ae350: Use kconfig to set platform version and default name

This patch makes andes platform name and version can be set in
menuconfig interface.

Signed-off-by: Yu Chien Peter Lin <peterlin@andestech.com>
Reviewed-by: Leo Yu-Chi Liang <ycliang@andestech.com>
Reviewed-by: Anup Patel <anup@brainfault.org>