main/linux-postmarketos-qcom-msm8916: upgrade to 5.9-rc7

After lots of time, a huge upgrade for MSM8916! :)

linux-postmarketos-qcom-msm8916:

• Update to Linux 5.9-rc7
• Add "BAM DMUX" driver as network interface to the modem for mobile data (contributed by @Minecrell, separate MR coming soon)
• Major rewrite/cleanup of all MSM8916 device trees (contributed by @Minecrell)
• Lots of cleanup everywhere (contributed by @Minecrell)
• I hope I did not forget something :)
• Devices:
  • bq-paella: Add vibrator (contributed by @lazzardo)
  • samsung-j5nlte: Add display (contributed by @nergzd723)
  • samsung-a2015 (a3u/a5u): Fix USB-OTG detection (contributed by @TravMurav)
  • "Initial" support for Xiaomi Redmi 2 (wingtech-wt88047) (contributed by @Minecrell, !1604)
    • USB
    • Storage (eMMC, SD card)
    • Display, brightness control
    • Touchscreen, buttons
    • IMU (accelerometer+gyroscope)
    • Notification LED
    • Sound
    • WiFi, Bluetooth
    • Modem
  • Initial support for Motorola Moto E 2015 (motorola-surnia) (contributed by @wiktorek140)
    • USB
    • Storage (eMMC, SD card)
    • Display, brightness control
    • Touchscreen, buttons
    • WiFi, Bluetooth
    • Battery status
  • Initial support for Samsung Galaxy Grand Prime (contributed by @WTechNinja, !1401 (merged))
    • USB
    • Storage (eMMC, SD card)
  • Initial support for Oppo Mirror 5s (oppo-a51f) (contributed by @natsu1978, !1503 (merged))
    • USB
    • Storage (eMMC, SD card)
    • WiFi, Bluetooth

soc-qcom-msm8916:

• Add UCM configuration for Xiaomi Redmi 2 (wt88047) (contributed by @Minecrell)
• Add UCM configuration for Xiaomi Redmi Note 4 (xiaomi-mido) (contributed by aka_)
• Some fixes to UCM configuration for BQ Aquaris X5 (bq-paella)

Cc: @Mis012 @TravMurav @jja2000 @srxl @rvlander @lazzardo @minlexx @wiktorek140 @WTechNinja @natsu1978