Switch from add_lunch_combo to COMMON_LUNCH_CHOICES

Bug: 77599627
Test: lunch  [see entries in list]
Change-Id: I196cf23f94ca87984ad0fee0d8c541123cac6135

AndroidProducts.mk

@@ -16,3 +16,6 @@
 
 PRODUCT_MAKEFILES := \
     $(LOCAL_DIR)/uml.mk
+
+COMMON_LUNCH_CHOICES := \
+    uml-userdebug

vendorsetup.sh

-add_lunch_combo uml-userdebug