STRIX kernel for Xiaomi Redmi Note 6 Pro (tulip)

Changelog v2.9:

• Rebase source.
• Merge stable linux v4.4.239.
• Disable IPC logging entirely.
• Checkout msm performance to 4.19 (touch boost feature is removed).
• Optimized Adreno 5xx GPU.
• Add BBR2 TCP.
• Use less power efficient workqueue (to increase stability a little and reduce latency).
• Reduce tweaks to sound.
• Hardcode DSB and sched_boost for top-app.
• Fix charge when it is above 70% the battery often appears fully charged.
• Don't enable SAE flag by default on Wi-Fi driver.