drm: Kbuild: add omap_drm.h to the installed headers
The header defines the userspace API exported by the omapdrm driver, install it to make the definitions available to userpace. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
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