arm64: defconfig: enable EDAC GHES option

Enable CONFIG_EDAC_GHES option for ARM64,so that the memory errors
are processed and reported to the user space.

Signed-off-by: Shiju Jose <shiju.jose@huawei.com>
Acked-by: Timur Tabi <timur@codeaurora.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>