arm64: defconfig: enable CONFIG_ACPI_APEI_EINJ

Enable APEI EINJ for ARM64 to support the error injection.

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