drm/i915/uc: Add pretty printer for uc firmware

Debugfs for GuC and HuC load info have similar common part.
Move and update dump of uc_fw to separate helper for reuse.

Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20171017094449.22584-1-michal.wajdeczko@intel.com


Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>