drm/i915: Reorganize plane/fb dump in debugfs

Eliminate the special cases for the primary and cursor planes and just
dump all the information consistently for all the planes.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191129185434.25549-4-ville.syrjala@linux.intel.com


Reviewed-by: Ramalingam C <ramalingam.c@intel.com>