No longer export CallSubjectDialog am: 380a088b2d am: d27d9728e6 am: 2ed5ddac8f

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Dialer/+/17034408

Change-Id: Ia7ee043a04fe0a76d85f1b8d1e84842f1bf4107f