vulkan: Rev 7 of ANDROID_native_buffer

Adds a new structure to be chained to GetPhysicalDeviceProperties2KHR in
order to determine whether the loader should be exposing
KHR_shared_presentable_image (and if so, which present modes can be
supported).

V3: Replace separate enables with combined 'sharedImage'

Test: build
Change-Id: I32a8b1f09f413aa4ea2a37ea0d50914a20967865