Copy vendor & odm .map files when using vendor_otatools

  Copy IMAGES/vendor.map and IMAGES/odm.map files when building vendor images
using vendor otatools. Fixes validate_target_files failure.

Bug: 220126689
Bug: 186097910

Test: sign_target_files_apks \
        --vendor_otatools=otatools_vendor_dir \
	--vendor_partitions=vendor,odm \
	merged-target_files.zip \
	signed-target_files.zip

Change-Id: Iaf904c90761b3830cf81af2561695c81bfc6c70d