drm/amd/pm: Update intermediate power state for SI

In the Linux kernel, the following vulnerability has been resolved:

drm/amd/pm: Update intermediate power state for SI

Update the current state as boot state during dpm initialization.

During the subsequent initialization, set_power_state gets called to

transition to the final power state. set_power_state refers to values

from the current state and without current state populated, it could

result in NULL pointer dereference.

For ex: on platforms where PCI speed change is supported through ACPI

ATCS method, the link speed of current state needs to be queried before

deciding on changing to final power state's link speed. The logic to query

ATCS-support was broken on certain platforms. The issue became visible

when broken ATCS-support logic got fixed with commit

f9b7f3703ff9 ("drm/amdgpu/acpi: make ATPX/ATCS structures global (v2)").

Bug: https://gitlab.freedesktop.org/drm/amd/-/issues/1698