i965: add {X,A}BGR2101010 to 'intel_image_formats'

This patch adds {X,A}BGR2101010 entries to the list of supported
'intel_image_formats'.

Bug: https://crbug.com/776093
Reviewed-by: Chad Versace <chadversary@chromium.org>
Reviewed-by: Tapani Pälli <tapani.palli@intel.com>

src/mesa/drivers/dri/i965/intel_screen.c

    { __DRI_IMAGE_FOURCC_XRGB2101010, __DRI_IMAGE_COMPONENTS_RGB, 1,
      { { 0, 0, 0, __DRI_IMAGE_FORMAT_XRGB2101010, 4 } } },
 
+   { __DRI_IMAGE_FOURCC_ABGR2101010, __DRI_IMAGE_COMPONENTS_RGBA, 1,
+     { { 0, 0, 0, __DRI_IMAGE_FORMAT_ABGR2101010, 4 } } },
+
+   { __DRI_IMAGE_FOURCC_XBGR2101010, __DRI_IMAGE_COMPONENTS_RGB, 1,
+     { { 0, 0, 0, __DRI_IMAGE_FORMAT_XBGR2101010, 4 } } },
+
    { __DRI_IMAGE_FOURCC_ARGB8888, __DRI_IMAGE_COMPONENTS_RGBA, 1,
      { { 0, 0, 0, __DRI_IMAGE_FORMAT_ARGB8888, 4 } } },