Add intel_panel_fitter tool

Add intel_panel_fitter tool

The tool allows you to change the panel fitter settings, so you can
change the size of the screen being displayed on your monitor without
changing the real pixel size of your desktop. The biggest use case for
this tool is to work around overscan done by TVs and some monitors in
interlaced mode.

v2: reviews by Ben, Chris and Rodrigo
 - don't install
 - use intel_register_access_init
 - check for maximum X and Y values
 - add a disclaimer saying this is not the real solution
 - print less when pf is disabled and option '-l' is used

Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>