Ignore some properties for T and above.

As requested by reminv@, their team wants the source code in
sc-mainline-prod to be strictly the same as the code in AOSP. Therefore,
we need to ignore `standalone_contents` in the
`systemserverclasspath_fragment` module and
`systemserverclasspath_fragments` in the `sdk` module in order to merge
aosp/1925682 into sc-mainline-prod.

- `standalone_contents` in the `systemserverclasspath_fragment` module
  does nothing but adds its contents as dependencies of the APEX.
- `systemserverclasspath_fragments` in the `sdk` module does nothing.

Bug: 203198541
Test: TARGET_BUILD_APPS=com.android.tethering vendor/google/build/mainline_modules_bundles.sh
Change-Id: I56ca22aa91a807cd113dfda2fabaeb49ecabe289
Merged-In: I09a6fd1d3db85c194330da9b751702a9bf069e26