OMAP: DSS2: OMAPFB: install omapfb.h

omapfb has several custom ioctls so user space needs
the header in order to utilize them.
Signed-off-by: Ville Syrjälä <ville.syrjala@nokia.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@nokia.com>

include/linux/Kbuild

@@ -125,6 +125,7 @@ header-y += nfs2.h
 header-y += nfs4_mount.h
 header-y += nfs_mount.h
 header-y += nl80211.h
+header-y += omapfb.h
 header-y += param.h
 header-y += pci_regs.h
 header-y += perf_event.h