drm/i915: Fix SEL_FETCH_{SIZE,OFFSET} registers

drm/i915: Fix SEL_FETCH_{SIZE,OFFSET} registers

Fix up the SEL_FETCH_{SIZE,OFFSET} registers. A classic
copy-paste fail on my part.

I even had a small test to confirm that the old and new register
offsets match, but somehow I must have screwed things up when
running it, and likely just ended up comparing the old defines
against themselves :/

Cc: Jani Nikula <jani.nikula@intel.com>
Fixes: 4bfa8a140db3 ("drm/i915: Define SEL_FETCH_PLANE registers via PICK_EVEN_2RANGES()")
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240524155000.13358-1-ville.syrjala@linux.intel.com
Reviewed-by: Jani Nikula <jani.nikula@intel.com>