zenfone9: 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
Change-Id: I400392ba9cf7e6d35af78d6b668d52abee27497d
diff --git a/AndroidProducts.mk b/AndroidProducts.mk
index 8ca8b0c..4937c40 100755
--- a/AndroidProducts.mk
+++ b/AndroidProducts.mk
@@ -3,5 +3,5 @@
 
 COMMON_LUNCH_CHOICES := \
     omni_zenfone9-user \
-    omni_zenfone9-userdebug \
+    omni_zenfone9-trunk_staging-userdebug \
     omni_zenfone9-eng
\ No newline at end of file