Pass driver root to nvinfo.New in device plugin main

The `nvinfo` instance passed to `validateFlags` needs to have
the driver root path, otherwise the `HasNvml` call will fail
(`libnvidia-ml.so.1` won't be found). This will in turn cause
`validateFlags` to error out if `AnyCDIEnabled` is true.

Signed-off-by: Jean-Francois Roy <jeroy@nvidia.com>

Author: jfroy

cmd/nvidia-device-plugin/main.go

@@ -338,6 +338,7 @@ func startPlugins(c *cli.Context, o *options) ([]plugin.Interface, bool, error)
 	)
 	devicelib := device.New(nvmllib)
 	infolib := nvinfo.New(
+		nvinfo.WithRoot(string(driverRoot)),
 		nvinfo.WithNvmlLib(nvmllib),
 		nvinfo.WithDeviceLib(devicelib),
 	)