drm/i915/reg: fix PCH transcoder timing indentation

Adhere to the style described at the top of i915_reg.h.

Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/f56e48a927692cec382e292602e0fa68e37f3b93.1725974820.git.jani.nikula@intel.com


Signed-off-by: Jani Nikula <jani.nikula@intel.com>