Revert "Deprecate android.hidl.allocator after U vintf"

Revert submission 2904348-deprecate_hidl_allocator

Reason for revert: b/319562435

Reverted changes: /q/submissionid:2904348-deprecate_hidl_allocator

Change-Id: I47177a0d80f1fe648544bdca9b0e6792f1fbc043
1 file changed