drm/amd/powerplay: don't include the smu11 driver if header in smu v11 (v2)

This header is actually for each asic, so we should not include in smu_v11_0.c.
And rename the one for navi10.

v2: add hack for XGMI (Alex)

Signed-off-by: Huang Rui <ray.huang@amd.com>
Reviewed-by: Kevin Wang <kevin1.wang@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>