veux: Don't inherit updatable_apex.mk

This is because of the following reasons:
- Many build scripts force disable it anyways by settings OVERRIDE_TARGET_FLATTEN_APEX env flag so why bother rendering differences in official and local builds [1][2].
- Compressed apex causes issues with OTA on A only devices [3].
- Compressed apex may cause issues on devices which do not meet kernel requirements [4].
- Highly anticipated mainline modules update aka Play System updates is limited to OEMs/Pixels only [5], we don't do such things on AOSP; shipping Pixel prebuilt apex components feels somewhat unethical.

Ref:
[1]: https://github.com/lineageos-infra/build-config/blob/8e435ce7ff7c74097b3500e143380273e099aefb/android/build.sh#L9
[2]: https://github.com/LineageOS/android_build/blob/lineage-18.1/target/product/updatable_apex.mk#L19
[3]: RecoverySystemService: Failed to reserve space for compressed apex
[4]: https://source.android.com/devices/tech/ota/apex#kernel-requirements
[5]: "pushed to end-user devices, either by Google (using the Google Play Store infrastructure) or by the Android partner (using a partner-provided OTA mechanism)." as stated in https://source.android.com/devices/architecture/modular-system#architecture

test: m, boots and ota.

Change-Id: I5b5c2366398791100fa2222ef779ca4d90842211

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