drm/amdgpu: introduce amdgpu_sdma_set_vm_pte_scheds

drm/amdgpu: introduce amdgpu_sdma_set_vm_pte_scheds

All sdma versions used the same logic, so add a helper and move the
common code to a single place.

---
v2: pass amdgpu_vm_pte_funcs as well
v3: drop all the *_set_vm_pte_funcs one liners
v5: rebased
---

Signed-off-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>