WaveOS v4.8

Device Tree ChangeLog

- Cleanup all unnecessary hints in powerhint.json, tune it for better performance and battery backup

- Switch Back to AOSP bluetooth stack

- Add support for LCD HBM and CABC

- Create dummy libqti-perfd-client so that Goodix/FPC fingerprint sensor blobs don't complain

Kernel ChangeLog

- Enable Simple Low Memory Killer (it's better and less aggressive so apps stays in bg for much longer times)

- Disable more debugging

- Disable redundant Spectre v2 mitigations 

- Merge 4.14.246

- Shorten PELT ramp/delay halflife to 16 ms