drm/amd/powerplay: implement get_vbios_bootup_values function for smu11 (v2)

This patch implements get_vbios_bootup_values function for smu11 to fetach
firmwareinfo member from atombios.

v2: use switch statement based on the content revision (Alex)

Signed-off-by: Huang Rui <ray.huang@amd.com>
Reviewed-by: Kevin Wang <Kevin1.Wang@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>