oneplus instantnoodlep: add sm8250 mainline kernel to package
As mentioned in 372287e2 we broke up the MRs into downstream first (which was completed with the noted commit) and mainline, which I am adding now. This is the sm8250 mainline kernel. This MR:
- Updates the linux-postmarketos-qcom-sm8250 to the lastest commit
- Adds a few kernel modules in the defconfig
- Adds the mainline kernel as a subpackage to the device-oneplus-instantnoodlep pkg