drm/i915: Add HAS_PCH_LPT_H()

We have HAS_PCH_LPT_LP() already, so add HAS_PCH_LPT_H() and use it
where appropriate.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1448893432-6978-4-git-send-email-ville.syrjala@linux.intel.com


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