Support PRODUCT_BUILD_VBMETA_IMAGE for target files

Currently we support skip building vbmeta.img when
PRODUCT_BUILD_VBMETA_IMAGE is set to false, which is used
when generating a system-only or vendor-only build artifacts.

However, when using `make dist` to build target files,
vbmeta.img is still generated. This change fixes this by
passing the related info to misc_info.txt for the release
tool to skip building vbmeta.img when necessary.

To make this happen, a device config should:
 1. Set PRODUCT_BUILD_VBMETA_IMAGE := false
 2. Remove 'vbmeta' from AB_OTA_PARTITIONS:
     AB_OTA_PARTITIONS += \
	 boot \
	 system \
    -    vbmeta \
	 dtbo \
	 product \
	 system_ext \
         vbmeta_system

Bug: 161659370
Test: `make dist` and checks the target file does not include vbmeta.img
Change-Id: Iddca9fe0b171a50a80e5a88aa462e118f18a7e6f

core/Makefile

@@ -4144,6 +4144,9 @@ ifdef BOARD_USES_VENDORIMAGE
 	$(hide) echo "board_uses_vendorimage=true" >> $@
 endif
 ifeq ($(BOARD_AVB_ENABLE),true)
+ifeq ($(BUILDING_VBMETA_IMAGE),true)
+	$(hide) echo "avb_building_vbmeta_image=true" >> $@
+endif # BUILDING_VBMETA_IMAGE
 	$(hide) echo "avb_enable=true" >> $@
 	$(hide) echo "avb_vbmeta_key_path=$(BOARD_AVB_KEY_PATH)" >> $@
 	$(hide) echo "avb_vbmeta_algorithm=$(BOARD_AVB_ALGORITHM)" >> $@

tools/releasetools/add_img_to_target_files.py

@@ -959,8 +959,9 @@ def AddImagesToTargetFiles(filename):
           if item not in vbmeta_vendor.split()]
       vbmeta_partitions.append("vbmeta_vendor")
 
-    banner("vbmeta")
-    AddVBMeta(output_zip, partitions, "vbmeta", vbmeta_partitions)
+    if OPTIONS.info_dict.get("avb_building_vbmeta_image") == "true":
+      banner("vbmeta")
+      AddVBMeta(output_zip, partitions, "vbmeta", vbmeta_partitions)
 
   if OPTIONS.info_dict.get("use_dynamic_partitions") == "true":
     banner("super_empty")