drm/i915: rename range_overflows_end() to range_end_overflows()

drm/i915: rename range_overflows_end() to range_end_overflows()

Rename range_overflows_end() to range_end_overflows(), along with the _t
variant.

It's all rather subjective, but I think range_end_overflows() reads
better.

Cc: Kees Cook <kees@kernel.org>
Cc: "Gustavo A. R. Silva" <gustavoars@kernel.org>
Cc: linux-hardening@vger.kernel.org
Reviewed-by: Jouni Högander <jouni.hogander@intel.com>
Link: https://lore.kernel.org/r/20250829174601.2163064-1-jani.nikula@intel.com
Signed-off-by: Jani Nikula <jani.nikula@intel.com>