Show big icon in messaging- and call notifications

Even though the showBigIcon attribute is set to true, the big
notification icon is not shown in messaging and call HUNs.

Because the messaging and call notifications are implemented
differently, this requires two changes:

1) For call: Use the large icon instead of the small icon when binding
   the body view.

2) For messaging: Check the showBigIcon attribute before assuming the
   large icon should be set to gone.

Bug: 188424083
Test: Manual testing in emulator for Android Automotive.
Change-Id: Ic4dc93b72c10fe9d2efeef325c36e5ad994deafc
2 files changed