realme-x3: new device (Realme X3) (MR 5839)

device/testing/device-realme-x3/30-gpu-firmware.files

device/testing/device-realme-x3/51-qcom-sm8150.lua

device/testing/device-realme-x3/APKBUILD

device/testing/device-realme-x3/alsa-ucm-conf/HiFi.conf

device/testing/device-realme-x3/alsa-ucm-conf/x3.conf

...-realme-x3/device-realme-x3-nonfree-firmware.post-install

device/testing/device-realme-x3/deviceinfo

device/testing/device-realme-x3/modules-initfs

device/testing/firmware-realme-x3/APKBUILD

device/testing/linux-realme-x3/APKBUILD

device/testing/linux-realme-x3/config-realme-x3.aarch64