ggml-backend: raise GGML_MAX_SPLIT_INPUTS #15722
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With FlashAttention enabled Gemma 3n can crash when using many GPUs due to
GGML_MAX_SPLIT_INPUTSbeing too low, see #15434 (comment) . The maximum value with which I can provoke the issue is 19 when using 6 GPUs. This PR sets the value to 30 so that there is some margin above this value.