Fix lunch choices for git_main

We add "trunk_staging-" for all COMMON_LUNCH_CHOICES so they are
valid in the trunk stable setup.

Bug: 307738446
Test: lunch
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:1b54ce4db1a3c3ba067124a7e491ae29f8e50666)
Merged-In: I400392ba9cf7e6d35af78d6b668d52abee27497d
Change-Id: I400392ba9cf7e6d35af78d6b668d52abee27497d
1 file changed