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drm_hwcomposer: Add refcount for GEM handle

The linux kernel doesn't provide reference counting for the handle returned by FD_TO_HANDLE ioctl. It means that if the same Gralloc buffer is imported twice, the first GEM_CLOSE will destroy the handle even if it is still in use by another import.

Remedy this issue by doing the reference counting directly in the DRM generic platform support: ImportHandle() will increase the reference, while ReleaseHandle() will decrease and close it, if necessary.

Signed-off-by: Vincent Donnefort vincent.donnefort@arm.com

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