linux-postmarketos-qcom-msm8916: upgrade to 6.6

linux-postmarketos-qcom-msm8916

• Update to Linux v6.6
• Lots of cleanup and upstreaming, more than 40 commits upstreamed for 6.7 (by @Minecrell @TravMurav @wonderfulShrineMaidenOfParadise @a_a @vknecht @jakko)

Device changes:

• Add KTD2026 LED driver, used by bq-paella, bq-piccolo and acer-a1-724 (contributed by @a_a)
• bq-piccolo: Set proximity near level to fix detection in iio-sensor-proxy (contributed by @a_a)

New devices:

• Vivo Y21L (contributed by @raihan2000)
  • eMMC, SD card, USB, Buttons, WiFi/BT
  • Sensors (Accelerometer, Magnetometer, Light)
  • No display yet

Testing Team:

• Qualcomm Snapdragon 410/412 (MSM8916):
  • bq-paella (@PanzerSajt)
  • samsung-gt58 (@Breakfastisready)

Risk should be low though. There were no major changes. Probably also fine to let it get tested in edge for a while.