GSI: add the messaging app

in order to pass
android.telecom.cts.ExtendedInCallServiceTest#testOnCannedTextResponsesLoaded
on GSI.

Bug: 66983288
Test: boot marlin-user with GSI (aosp_arm64_ab-userdebug) and pass the test.
Change-Id: I77a2d59e5525c0e93806312a9cf79be5093523bc
diff --git a/target/product/treble_common.mk b/target/product/treble_common.mk
index f885646..13b7769 100644
--- a/target/product/treble_common.mk
+++ b/target/product/treble_common.mk
@@ -26,6 +26,11 @@
 # Split selinux policy
 PRODUCT_FULL_TREBLE_OVERRIDE := true
 
+# The Messaging app:
+#   Needed for android.telecom.cts.ExtendedInCallServiceTest#testOnCannedTextResponsesLoaded
+PRODUCT_PACKAGES += \
+    messaging
+
 # All VNDK libraries (HAL interfaces, VNDK, VNDK-SP, LL-NDK)
 PRODUCT_PACKAGES += vndk_package