drm/amdgpu: add rlcv/rlcp version info to debugfs

amdgpu_firmware_info debugfs will show rlcv/rlcp
ucode version info

Signed-off-by: Hawking Zhang <Hawking.Zhang@amd.com>
Reviewed-by: Likun Gao <Likun.Gao@amd.com>
Reviewed-by: Feifei Xu <Feifei.Xu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>