amdgpu fixes for 6.6 stable

[Alex Deucher <alexdeucher@xxxxxxxxx>]

Hi Greg, Sasha,

Please pick up the following upstream commits for 6.6.x stable:
commit 04cef5f58395 ("drm/amd/amdgpu/amdgpu_doorbell_mgr: Correct
misdocumented param 'doorbell_index'")
commit 367a0af43373 ("drm/amdkfd: get doorbell's absolute offset based
on the db_size")

They fix the following reported issue:
Link: https://gitlab.freedesktop.org/drm/amd/-/issues/3007
Fixes: c31866651086 ("drm/amdgpu: use doorbell mgr for kfd kernel doorbells")

Thanks,

Alex