local_manifests: Add avicii

<?xml version="1.0" encoding="UTF-8"?>

<manifest>

  <project name="e/devices/android_device_oneplus_avicii" path="device/oneplus/avicii" remote="e"/>

  <project name="e/devices/android_hardware_oplus" path="hardware/oplus" remote="e"/>

  <project name="LineageOS/android_kernel_oneplus_sm7250" path="kernel/oneplus/sm7250" remote="github" revision="lineage-21"/>

</manifest>