[BE][MPS] Mark gamma inputs as const

[malfet]

Stack from ghstack (oldest at bottom):

• [MPS][BE] Move vectypes from Quantized to utils #145312
• [MPS][BE] Prepare Gamma funcs to be moved ot headers #145309
• -> [BE][MPS] Mark gamma inputs as const #145295
• [BE][MPS] Move Gamma kernels to its own file #145289

Doubt it will change the perf, but it's good to correctly mark const inputs as const

[pytorch-bot]

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[malfet]

@pytorchbot merge -f "MPS + Lint are green"

[pytorchmergebot]

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