Nightmare Kernel Xtreme v1.1

Changelog:

• Merge linux tag v4.4.264

• Merge tag 'LA.UM.7.2.r1-09600-sdm660.0' for WiFi drivers

• Update compiler to latest Proton clang 13 build date 20210327

• mm: Do not periodically flush dirty pages

• slimbus: Fix potential memory leak

• Actually same as Nightmare normal version