drm/amdgpu: fix vm pte pde flags to 64-bit for sdma (v3)

v2: fix for all sdma engines
v3: squash in fix for SI/CI

Signed-off-by: Junwei Zhang <Jerry.Zhang@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>