Fix crash after dequeueNativeBuffer fails

Anytime dequeueNativeBuffer fails, it sets mDequeuedIndex to -1.
This is causing a crash latter, when getCurrentSkSurface tries
to index mNativeBuffers[mDequeuedIndex].
This CL removes mDequeuedIndex and improves Vulkan swapchain
error handling.

Test: Ran Camera app
Bug: 129024275
Change-Id: Ieeb685c3a1b33f23ce2334d286199a44ace53165