frstprjkt/valeryn_xiaomi_sm6115 ? reverse-engineered prompt

Build me a working Linux kernel project for Xiaomi SM6115 phones, based on this Valeryn 4.19 kernel tree.

I want the repository to be easy to build from source, with clear instructions for someone who just wants to compile a kernel image and related outputs for these devices. Make sure the Android build files and kernel config setup are in good shape, and that the project feels ready for device specific development and testing. If anything important is missing, add sensible defaults and simple guidance in the README so I can get started without digging through the whole tree.

Please also make sure the build process is practical for current Android kernel workflows, and if you need to check anything uncertain, look up the current docs online.