Reset buffer tracking state in VulkanSurface.

When we fail to create an SkSurface from a dequeued
buffer we then call cancelBuffer on that buffer. However,
we don't update our tracking to say the buffer is no
longer dequeued with and doesn't own the fence any more.

I don't think this is the main issue causing the crash in
the attached bug because I don't think we're seeing the
error in the logs for this chunk of code. However this
possibly related issue was found while tracking down our
use of the dequeue_fence fd.

Test: manual building and running of phone
Bug: 187240173

Change-Id: Icb4099eeea5be6aedd5376e07a6e3454f5d1d1e3