drm/amdgpu/psp: start rlc autoload after psp recieved all gfx firmware

RLC handles firmware loading for gfx to support vddgfx feature.

Signed-off-by: Hawking Zhang <Hawking.Zhang@amd.com>
Reviewed-by: Le Ma <Le.Ma@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>