drm/amdgpu/smu11.0: add missing IP version check

Add missing check in smu_v11_0_init_display_count(),

Fixes: af3b89d3

 ("drm/amdgpu/smu11.0: convert to IP version checking")
Reviewed-by: Guchun Chen <guchun.chen@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>