PiP: Disable enterSplit for now. Bug: 206645013 Test: Enter split button no longer appears (cherry picked from commit eab029ce8d58e1d6d4a5e29959b424220f2106d8) (cherry picked from commit c03eca68e245f7f873137b3e0c741359ead481de) Merged-In: I6237dd1c88f50733ab24e45806c413d5777032e9 Change-Id: I6237dd1c88f50733ab24e45806c413d5777032e9