To be normalized. Built this way:
```
cat \
arch/arm64/configs/msm8937-perf_defconfig \
arch/arm64/configs/ext_config/moto-msm8937.config \
arch/arm64/configs/ext_config/moto-msm8937_64.config \
arch/arm64/configs/ext_config/moto-msm8937-surfna.config \
> surfna.64.defconfig
```