USB4 DPIA fixups for 6.1.y/6.2

["Limonciello, Mario" <mario.limonciello@xxxxxxx>]

Hi,

The following two commits help with initialization of DPIA which is used 
for DP tunneling over USB4 within amdgpu.

Needed for both 6.1.y and 6.2.y:
ead08b95fa50 ("drm/amd/display: Fix race condition in DPIA AUX transfer")
0cf8307adbc6 ("drm/amd/display: Properly reuse completion structure")

Needed just for 6.2:
0cf8307adbc6 ("drm/amd/display: Properly reuse completion structure")

0cf8307adbc6  was actually already tagged to go stable but it doesn’t 
apply cleanly to 6.1.y
because of the above mentioned dependency so it didn’t come back.

Can you please bring them back as requested above?

Thanks,