drm/i915/display/misc: use intel_de_rmw if possible

The helper makes the code more compact and readable.

Signed-off-by: Andrzej Hajda <andrzej.hajda@intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230110113656.4050491-1-andrzej.hajda@intel.com