main/linux-postmarketos-qcom-msm8916: upgrade to 5.7

• Update to Linux 5.7
• motorola-harpia: Add battery reporting (contributed by @srxl)
• bq-paella: Add accelerometer/magnetometer/gyroscope (contributed by @lazzardo)
• bq-paella: Expose touch key backlight as LED (contributed by @lazzardo)
• Upstreamed a few patches

Cc: @Mis012 @TravMurav @jja2000 @srxl @rvlander @lazzardo @minlexx @jugendhacker @LorenDB