drm/msm/adreno: Add MMU fault handler to adreno_gpu_func

drm/msm/adreno: Add MMU fault handler to adreno_gpu_func

Move MMU fault handler for each generation to adreno function list. This
will help to use common code for mmu pagefault handler registration between
a6x/a7x and a8x layer.

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Signed-off-by: Akhil P Oommen <akhilpo@oss.qualcomm.com>
Patchwork: https://patchwork.freedesktop.org/patch/689007/
Message-ID: <20251118-kaana-gpu-support-v4-8-86eeb8e93fb6@oss.qualcomm.com>
Signed-off-by: Rob Clark <robin.clark@oss.qualcomm.com>