set mp1 unload state will cause the SMC FW can't accept any SMU message,
skip to set mp1 unload state to avoid following case fail:
- runtime pm case.
- gpu reset case.

Fixes: 72aeb6ee ("drm/amd/pm: fix driver reload SMC firmware fail issue for smu13")
Signed-off-by: Yang Wang <KevinYang.Wang@amd.com>
Reviewed-by: Kenneth Feng <kenneth.feng@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>