Add missing R partitions in AVB_FOOTER_ARGS

If we miss these entries, the signing script won't correctly update
the avb prop to build the vbmeta. This cl adds the missing partitions
for R build.

In the followup, we need to make the map in sync with AVB_PARTITIONS in
common.py

Bug: 181787095
Test: run sign_target_files_apks
Change-Id: I39a308fb7028b45ce08f0ca3c6ad61a6c13e8082