drm/amdgpu: show explicit name instead of id in psp_cmd_submit_buf

Use amdgpu_ucode_name to show ucode name and psp_gfx_cmd_name to
show psp_gfx_cmd name in psp_cmd_submit_buf.

v2: adjust function name

Signed-off-by: Lang Yu <Lang.Yu@amd.com>
Reviewed-by: Huang Rui <ray.huang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>