vulkan: fix CI llvmpipe by allowing dim 3 broadcast in MUL_MAT (#31239)
* vulkan: allow dim 3 broadcast in MUL_MAT
supports_op rejected every MUL_MAT whose src0 and src1 differ in ne3,
although mul_mm, mul_mmq and mul_mat_vec already broadcast src0 over
dim 3 through broadcast3. Such a matmul then ran on the CPU with a
copy of the weight, and the split layout changed with the number of
streams in the ubatch.
Keep the strict check for MUL_MAT_ID only, and route the broadcast
cases away from mul_mat_vec_nc, the one path that requires equal ne3.
* tests : harden MUL_MAT with permuted dim 3 broadcast cases
Harden the MUL_MAT coverage with a weight broadcast over dim 3 against
a permuted per-stream activation, the shape of an MLA output
projection with a non unified KV cache, for a single token, several
heads and several tokens per stream.
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