drm/amdgpu: query boot config cap before issue psp cmd

Only send boot_config cmd to ASICs that support dynamic
boot config. Otherwise, the boot_config cmd will fail.

Signed-off-by: Hawking Zhang <Hawking.Zhang@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: John Clements <john.clements@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>