drm/i915: fix IVB cursor support

commit 65a21cd6 upstream.

The cursor regs have moved around, add the offsets and new macros for
getting at them.

Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Tested-By: Eugeni Dodonov <eugeni.dodonov@intel.com>
Reviewed-By: Eugeni Dodonov <eugeni.dodonov@intel.com>
Signed-off-by: Keith Packard <keithp@keithp.com>
Signed-off-by: Robert Hooker <robert.hooker@canonical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>