b10681

vulkan: Change mul_mat_id to pad K rather than N (#27925)

The N padding is needed for mul_mat, but not mul_mat_id. For mul_mat_id,
we indirect the row index through a shared memory lookup table which avoids
any OOB row coordinate. But that callback doesn't bounds check K, so we
actually need K padding instead.

Website:

• https://llama.app

Attestations:

• https://github.com/ggml-org/llama.cpp/attestations/43857046

macOS/iOS:

• macOS Apple Silicon (arm64)
• macOS Apple Silicon (arm64, KleidiAI enabled) DISABLED
• macOS Intel (x64)
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Linux:

• Ubuntu x64 (CPU)
• Ubuntu arm64 (CPU)
• Ubuntu s390x (CPU)
• Ubuntu x64 (Vulkan)
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• Ubuntu x64 (ROCm 7.14)
• Ubuntu x64 (OpenVINO)
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