zenfone7: 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 21a2abd..0c13f8d 100755
--- a/AndroidProducts.mk
+++ b/AndroidProducts.mk
@@ -3,7 +3,7 @@
 
 COMMON_LUNCH_CHOICES := \
     omni_zenfone7-user \
-    omni_zenfone7-userdebug \
+    omni_zenfone7-trunk_staging-userdebug \
     omni_zenfone7-eng
     
     
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