amdgpu/dc: separate out some common code from bios parsers.

This extracts the bios parser object id handling into a common file.

Signed-off-by: Dave Airlie <airlied@redhat.com>
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>