drm/i915: Fix Ironlake M/N/P ranges to match the spec

Without this fix, some modes couldn't find appropriate clocks.

Signed-off-by: Zhao Yakui <yakui.zhao@intel.com>
Signed-off-by: Eric Anholt <eric@anholt.net>
Tested-by: Matthew Garrett <mjg@redhat.com>
1 file changed