riscv: defconfig: enable Andes SoC

Enable Andes SoC config in defconfig to allow the default
upstream kernel to boot on Voyager board.

Acked-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Ben Zong-You Xie <ben717@andestech.com>
Link: https://lore.kernel.org/r/20250711133025.2192404-9-ben717@andestech.com
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

Author: ben717-linux

arch/riscv/configs/defconfig

@@ -22,6 +22,7 @@ CONFIG_USER_NS=y
 CONFIG_CHECKPOINT_RESTORE=y
 CONFIG_BLK_DEV_INITRD=y
 CONFIG_PROFILING=y
+CONFIG_ARCH_ANDES=y
 CONFIG_ARCH_MICROCHIP=y
 CONFIG_ARCH_SIFIVE=y
 CONFIG_ARCH_SOPHGO=y