drm/amdgpu: fix switch-case indentation

Fix switch-case indentation in amdgpu_ctx_init_entity()

Signed-off-by: Nirmoy Das <nirmoy.das@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>