llama : enforce the same K and V cache types for DeepSeek V4; enable FA if V cache is quantized (#25871)
* llama : enforce the same K and V cache types for DeepSeek V4; enable FA if V cache is quantized
* llama : enforce the same K and V cache types for MLA models
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Co-authored-by: Stanisław Szymczyk <sszymczy@gmail.com>