TTS voice packs are better to be common for all devices
So the other device configs can have the common TTS voice packs
for the device build by "gs-common/device.mk"
And see doc, Preload Google Text-to-Speech (TTS) Voice Packs:
The voice packs are dowloanded follow the steps.
Bug: 333626474
Test: build passed and manual test
Change-Id: Idebba7ef2e69d0e9d2f30a94cbbcf70d2e3568d5
68ef072a54