Handle caremap for partial OTAs

When generating a partial OTA, filter care_map.pb to include only the
partial partitions, then generate OTA.

Test: Generate a partial OTA, make sure care map is included.

Change-Id: I0eaa12772eb1d06a57451e64f70689d3183f0115
diff --git a/tools/releasetools/Android.bp b/tools/releasetools/Android.bp
index 32a5dcb..aa6ec83 100644
--- a/tools/releasetools/Android.bp
+++ b/tools/releasetools/Android.bp
@@ -162,6 +162,7 @@
         "releasetools_common",
         "releasetools_verity_utils",
         "apex_manifest",
+        "care_map_proto_py",
     ],
     required: [
         "brillo_update_payload",