drm/amdgpu/gfx12: dump full CP packet header FIFOs

In dev core dump, dump the full header fifo for
each queue. Each FIFO has 8 entries.

Reviewed-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com>
Reviewed-by: Sunil Khatri <sunil.khatri@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>