drm_hwcomposer: Use gralloc0::perform API by minigbm bufferinfo getter

Using of internals of cros_gralloc_handle isn't recommended, since
it can be changed at any time. Meanwhile minigbm provides another
API to access buffer information based on gralloc0 perform() call.

ChromiumOS are using this API by mesa3d and other related projects.

Signed-off-by: Roman Stratiienko <roman.o.stratiienko@globallogic.com>
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