devices: use consistent pkgver (MR 4994)

device/testing/device-zte-p731a20/APKBUILD

device/testing/device-zuk-z2-row/APKBUILD

device/unmaintained/device-htc-flounder-downstream/APKBUILD

...ce/unmaintained/device-motorola-ocean-downstream/APKBUILD

...ntained/device-samsung-coreprimevelte-downstream/APKBUILD

...nmaintained/device-samsung-espresso10-downstream/APKBUILD

...nmaintained/device-samsung-expressatt-downstream/APKBUILD

.../unmaintained/device-samsung-lt01wifi-downstream/APKBUILD

...ce/unmaintained/device-xiaomi-cepheus-downstream/APKBUILD

...e/unmaintained/device-xiaomi-lavender-downstream/APKBUILD

device/unmaintained/device-xiaomi-tissot-downstream/APKBUILD