drm/i915/vrr: fix register file style

drm/i915/vrr: fix register file style

Fix indents, use of spaces vs. tabs, grouping, remove superfluous
comments, remove some line continuations, wrap macro arguments in
parens, rename dev_priv to display. This is the way.

Cc: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Cc: Mitul Golani <mitulkumar.ajitkumar.golani@intel.com>
Reviewed-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Link: https://lore.kernel.org/r/20250618155137.1651865-1-jani.nikula@intel.com
Signed-off-by: Jani Nikula <jani.nikula@intel.com>