drm/amdgpu: load sos binary properly on the basis of pmfw version

To be compatible with legacy IFWI, driver needs to carry legacy tOS and
query pmfw version to load them accordingly.

Add psp_firmware_header_v2_1 to handle the combined sos binary.

Double the sos count limit for the case of aux sos fw packed.

v2: pass the correct fw_bin_desc to parse_sos_bin_descriptor

Signed-off-by: Le Ma <le.ma@amd.com>
Reviewed-by: Lijo Lazar <lijo.lazar@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>