hikey960: gralloc960: Add usage field to map to older code

The r9p0 gralloc changed the names of usage field,
so add a compatibility union so it will work with
the platformhisi buffer importer in drm_hwcomposer

Change-Id: I75d6df4a81916a5cdf51cfed3750c7dceeedc03e
Signed-off-by: John Stultz <john.stultz@linaro.org>
1 file changed