config/arm64: add syzkaller_defconfig for kernel syzkaller testing

hulk inclusion
category: feature
bugzilla: 13539
CVE: NA

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Add a syzkaller_defconfig for kernel testing, which is derived
from hulk_defconfig.

https://github.com/google/syzkaller/blob/master/docs/linux/kernel_configs.mdSigned-off-by: NCheng Jian <cj.chengjian@huawei.com>
Reviewed-by: NYang Yingliang <yangyingliang@huawei.com>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>