libdrm: Add framebuffer modifiers uapi

Sync up with new kernel features as per commits:

e3eb3250d84ef97b766312345774367b6a310db8
93b81f5102a7cd270a305c2741b17c8d44bb0629
b5ff6e1637b683d5996ae11ac29afe406c0bee90
8c4f83fb1e8bf317e894f62d17a63c32b7a6b75e
570655b09b065d2fff1b8ab9bdb8308f4c5a05a3

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: dri-devel@lists.freedesktop.org
Cc: Rob Clark <robdclark@gmail.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Rob Clark <robclark@freedesktop.org>