Merge "swapchain: always return a signle image for shared presentation mode"...

Merge "swapchain: always return a signle image for shared presentation mode" into sc-qpr1-dev am: 1f251f13

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/native/+/15686506

Change-Id: Ifa42a6bee1aab03b331c0b012c8d1ad82c0f4cf8