... to make VkAHardwareBufferImage::init() happy.

Bug: b/147316305
Bug: b/141698760
Test: cts CtsGraphicsTestCases -t android.graphics.cts.BasicVulkanGpuTest
Change-Id: I599e2c0803a4008b80c1cd1f3ba9e4198cd0b72d
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/51069Tested-by: Jason Macnak <natsu@google.com>
Commit-Queue: Jason Macnak <natsu@google.com>
Kokoro-Result: kokoro <noreply+kokoro@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>