drm/amdgpu: Optimize the asic type fix code

Use a new struct array to define the asic information which
asic type needs to be fixed.

Signed-off-by: Ma Jun <Jun.Ma2@amd.com>
Reviewed-by: Kenneth Feng <kenneth.feng@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>