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:2c1fadaca2dd69202a3775847143e9771e8da30e)
Merged-In: I5baf9db894c35fd96d54207b2924d15b05266439
Change-Id: I5baf9db894c35fd96d54207b2924d15b05266439
diff --git a/AndroidProducts.mk b/AndroidProducts.mk
index b0d92fb..a7b4476 100644
--- a/AndroidProducts.mk
+++ b/AndroidProducts.mk
@@ -18,6 +18,6 @@
     $(LOCAL_DIR)/linaro_swr.mk \
 
 COMMON_LUNCH_CHOICES := \
-    db845c-userdebug \
-    rb5-userdebug \
+    db845c-trunk_staging-userdebug \
+    rb5-trunk_staging-userdebug \