Create product device name for Trout

Trout/Gull should have its own product name instead of sharing with
Cuttlefish, so that we don't need to remove others from
`out/target/product` before compiling, and LV build tools may tell if
the target and image are mismatching.

Bug: 175345855
Test: Build, flash and boot
Change-Id: I36ef500183d5f4dff2d78db29c3c7eff97d832b9
4 files changed