drm/amd/display: Fix null-derefs on non-dcn builds

Fixing regression introduced by
'Use real BE and FE index to program regs.'

Signed-off-by: Roman Li <Roman.Li@amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng@amd.com>
Acked-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>