tests: fix ddx_intel_after_fbdev to use intel_reg
tests: fix ddx_intel_after_fbdev to use intel_reg

intel_reg_dumper is gone, replaced by 'intel_reg dump'.

Signed-off-by: Jani Nikula <ba783f3beccaedfda693f41a15407d612a629408@intel.com>

tiagovignatti/intel-gpu-tools,tiagovignatti/intel-gpu-tools,tiagovignatti/intel-gpu-tools,tiagovignatti/intel-gpu-tools