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Try to load the 'sunxi_cedar_mod' kernel module. And if it loads
successfully, then report the DRI2 VDPAU name as 'sunxi'. This allows to
use libvdpau-sunxi without setting the VDPAU_DRIVER environment variable.
Signed-off-by: Siarhei Siamashka <siarhei.siamashka@gmail.com>