vulkan: Add I420 as recognized android yuv format

Bug: 186642883

Test: android.graphics.cts.MediaVulkanGpuTest#testMediaImportAndRendering w/

- guest h264 sw dec
- host h264 hw decoder (CUDA)
- host h264 sw decoder (ffmpeg)

Change-Id: I8d1df274b72452435da871334cafd81cc0bbd1aa