Handle compressed textures in synchronization2 barriers

[CatScarf]

Summary

• handle ETC2/ASTC decompression from vkCmdPipelineBarrier2, matching the existing legacy vkCmdPipelineBarrier path
• conservatively convert synchronization2 stage/access masks for the existing decompressor and expand its output barriers back to synchronization2
• restore compute bindings after decompression and submit the remaining dependency information through vkCmdPipelineBarrier2

Testing

• cmake --build build-clang18-upstream --target gfxstream_backend -j8
• Android Cuttlefish x86_64 runtime with native Vulkan, synchronization2, and ASTC emulation on an NVIDIA RTX 3080 host; the 3D scene rendered correctly without the black compressed-texture artifacts seen before this change

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